Mathematics High School

please help i’m so confused

Answers

Answer 1

Answer:

x = -2, -8.

Step-by-step explanation:

x =[(-b +/- √(b^2 - 4ac)] / 2a

x^2 + 10x + 16 = 0

Here a = 1, b = 10 and c = 16, so substituting in the formula:

x = [-10 +/- √(10^2 - 4*1*16)] / 2

= (-10 +/- √36)/2

= (-10 +/- 6)/2

= -4/2, -16/2

= -2, -8.

Answer 2

Answer:

x = - 8 , x = - 2

Step-by-step explanation:

x² + 10x + 16 = 0

with a = 1, b = 10 , c = 16

then using the given quadratic formula

x = [tex]\frac{-10+/-\sqrt{10^2-(4(1)(16)} }{2}[/tex]

= [tex]\frac{-10+/-\sqrt{100-64} }{2}[/tex]

= [tex]\frac{-10+/-\sqrt{36} }{2}[/tex]

= [tex]\frac{-10+/- 6}{2}[/tex]

then

x = [tex]\frac{-10-6}{2}[/tex] = [tex]\frac{-16}{2}[/tex] = - 8

x = [tex]\frac{-10+6}{2}[/tex] = [tex]\frac{-4}{2}[/tex] = - 2

Related Questions

Solve the following equation for x.

x2−47=17
List your answers separated by a comma, not using a ± sign and do not include x= in your answer.
Question 2 options:

3, 5

-9, 9

-8, 8

-30, 0

Answers

Answer:

-8, 8

Step-by-step explanation:

[tex] {x}^{2} - 47 = 17 \\ \\ {x}^{2} = 17 + 47 \\ \\ {x}^{2} = 64 \\ \\ x = \pm\sqrt{64} \\ \\ x = \pm \: 8 \\ \\ x = - 8, \: \: 8[/tex]

Divide: 91,035 ÷ 51 Enter the answer in the box.

Answers

1,758 is the answer

How are angles formed by intersecting lines related?

Answers

Answer:

When two lines intersect they form two pairs of opposite angles, A + C and B + D. Another word for opposite angles are vertical angles. Vertical angles are always congruent, which means that they are equal. Adjacent angles are angles that come out of the same vertex.

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At Hogwarts School of Witchcraft and Wizardry, Professor Snape was concerned about grade inflation, and suggested that the school should issue standardized grades (or 2-scores), in addition to the regular grades. How might this work? Harry was in four classes, each with 20 students. Harry's score, the class mean, and the class standard deviation are given below. Compute his standardized grade in each class. If we judged by standardized grades, where did he do best? Where did he do worst?

Answers

Answers:

The z scores are approximately:

Care of Magical Creatures: z = 0.333Defense Against the Dark Arts: z = 0.583Transfiguration: z = -0.263Potions: z = -0.533

From those scores, we can say:

Best grade = Defense Against the Dark ArtsWorst grade = Potions

=====================================================

Further Explanation:

We'll need to convert each given score to a corresponding standardized z score.

The formula to use is

z = (x - mu)/sigma

where,

x = given grade for each class mu = meansigma = standard deviation

Let's find the z score for the Care of Magical Creatures class

z = (x - mu)/sigma

z = (3.80 - 3.75)/(0.15)

z = 0.333 approximately

Repeat this process for the Defense Against the Dark Arts score.

z = (x - mu)/sigma

z = (3.60 - 3.25)/(0.60)

z = 0.583 approximately

And for the Transfiguration class as well

z = (x - mu)/sigma

z = (3.10 - 3.20)/(0.38)

z = -0.263 approximately

The negative z score means his grade below the average, whereas earlier the other scores were above the average since he got positive z scores.

Now do the final class (Potions) to get this z score

z = (x - mu)/sigma

z = (2.50 - 2.90)/(0.75)

z = -0.533 approximately

This grade is below average as well.

----------------------------

To summarize, we have these z scores

Care of Magical Creatures: z = 0.333Defense Against the Dark Arts: z = 0.583Transfiguration: z = -0.263Potions: z = -0.533

Harry did his best in Defense Against the Dark Arts because the z score of 0.583 (approximate) is the largest of the four z scores. On the other hand, his worst grade is in Potions because -0.533 is the lowest z score.

Need help in math ASAP

Answers

Answer:

Step-by-step explanation:

Find the volume of the wading pool

Use V = pi * r^2 * h

Givens

r = 6 feet

h = 1.5 feet

pi = 3.14

2 f^2 takes 2 minutes.

Solution

V = pr * r^2 + h

r = d/2

r = 6 / 2

r = 3 feet

Put the givens into the formula

V = 3.14 * 3 * 3 * 1.5

V = 42.39 cubic feet

Time

2 cubic feet takes 1 minutes

42.39 cubic feet takes x

2/42.39 = 1/x Cross multiply

2x = 42.39 Divide by 2

2x/2 = 42.39/2

x = 21 rounded to the nearest whole number.

WILL MARK BRAINLIEST!!
The times taken to assemble a clock at a factory are approximately normally distributed with a given mean l = 3 hr and standard deviation o = 0.5 hr. What percentage of the times are between 2 hr and 4 hr?
PLEASE SHOW WORK! :)

•95%

Answers

Answer:

95%

Step-by-step explanation:

McGrawHill

Tye has a square piece of yellow felt that has an area of 81 square inches. She wants to cut the largest circle possible from the material to
create a sun for her art project. What is the area of the felt circle? Use 3.14 for 1. Round to the nearest hundredth if necessary.

Answers

Answer:

Just Try to watch math antics

Step-by-step explanation:

Thank u

Round your answer to the nearest hundredth.
A= ?

Answers

Answer:

ok , using Pythagoras theorem hyp²=opp²+adj² therefore /CB/ will be opp , Making A the angle

7²=opp²+5² which is 49=x²+25

x²=49-25=✓24

=4.9

using SOH CAH TOA

sin A = 4.9/7

=0.7 , A is then sin-¹ 0.7

=136

use cosine since you are given the adjacent side and the hypotenuse

Cos θ = [tex]\frac{adj}{hyp}[/tex]

Cos θ = [tex]\frac{5}{7}[/tex]

use the inverse of cosine to find the angle

θ = [tex]cos^{-1}(\frac{5}{7})[/tex]

θ = 44.4153086...

θ = 44.42°

Nhich net force is larger? 1M/S,20 KG or 10 M/S, 1 KG

Answers

Answer:

Step-by-step explanation:

not right just need points

A parabola opening up or down has vertex (0,-4) and passes through (-12,14). Write its equation in vertex form

Answers

The value of a will be 0.125. Then the value of a is positive then the parabola will be upward.

What is the parabola?

It's the locus of a moving point that keeps the same distance between a stationary point and a specified line. The focus is a non-movable point, while the directrix is a non-movable line.

A parabola opening up or down has vertex (0,-4) and passes through (-12,14).

The equation of the parabola is given as

y = a(x - h)² + k

where (h, k) is the vertex of the parabola.

(h, k) = (0, -4)

Then the equation of the parabola will be

y = a(x)² - 4

The parabola is passing through (-12, 14). Then the value of a will be

14 = a(-12)² - 4

14 = 144a - 4

144a = 18

a = 1/8

a = 0.125

Then the equation of the parabola will be

y = 0.125x² - 4

If the value of a is positive then the parabola will be upward.

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Which represents the solution(s) of the graphed system of equations, y = x2 x – 2 and y = 2x – 2? (–2, 0) and (0, 1) (0, –2) and (1, 0) (–2, 0) and (1, 0) (0, –2) and (0, 1)

Answers

The solution to the system of equation are (0, -2) and (1, 0)

Solution to system of equations

System of equations are equations that has unknown and more than 1 equations.

Given the system of equations

y = x^2 + x – 2

y = 2x – 2

Equate both expressions

x^2 + x -2 = 2x - 2
x^2 - x = 0
x(x-1) = 0
x = 0 and x - 1 = 0
x = 0 and 1

If x = 0

y = 0 - 2 = -2

If x = 1

y = 2 - 2 = 0
Hence the solution to the system of equation are (0, -2) and (1, 0)

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Does anybody know this? I have a lot do before tommorow and I don't have much time. Look at the pictures

Answers

Answer:

Answer = 9/5

Step-by-step explanation:

2 yards = 72 inches (one yard equals 36 inches) Simplify 72/40 in and you get 9/5.

Hope that helps!

Answer:

9/5

Step-by-step explanation:

2 yard = 6 feet

40 inches = 3 4/12 feet

_____________________

Reduce 3 4/12 to 10/3 by simplification, convert 6 to a fraction

6/1 ÷ 10/3

Flip the 10/3 to multiply

6 × 3

1 × 10

= 18/10

Simplify 18/10 by dividing by 2

18 ÷ 2

10 ÷ 2

= 9/5

Help QUICKKKKK please

Answers

Answer:

Step-by-step explanation:

Remark

The exposed perimeter of the triangle is just the two smaller legs of the right triangle (6 + 8) + 10 units at the bottom of the rectangle + two 1/2 circles.

The area of the figure is the area of the triangle at the top + the area of the two 1/2 circles + the rectangle in the middle.

Givens

Shortest Triangle Leg = 6Middle Triangle Leg = 8Diameter of the 2 half circlespi = 3.14width of the rectangle in the middle = 8Length of the rectangle = 10d = 8r = d/2 = 8/2 = 4

Formula

Perimeter = 2 legs of the triangle + 2 half circles + bottom line

Area = (1/2) Leg1*leg2 + pi * r^2 + L * w

Solution

A Perimeter

Perimeter = 6 + 8 + 2*pi *r + 10

Perimeter = 24 + 2*3.14*4

Perimeter = 25.12

B Area

Area = 1/2 * 8 * 6 + 3.14*4^2 + 10* 8

Area = 24 + 50.24+ 80

Area = 150.24

Answer

P = 25.12

Area = 150.24

y = x+3
y= -2+12

solve by substitution or elimination
NEED ASAP PLS

Answers

Substitution
x+3=-2+12
X+3=10
X=7

Answer:

Step-by-step explanation:

Divide. Give the quotient and the remainder.
437/7

Answers

the quotient is 62 and the remaining number is 3

please help me im failing math

Answers

Answer:

Step-by-step explanation:

-Since dot or where the line originates is at 4 we know the answer will have the number 4.

-The dot is hollow, meaning it does not include the number it is on. So it cannot be "blank and equal to."

-Since the arrow points towards the right, we know it wants all values greater than 4, so we do: x>4.

-Back to my second point, we know it is not D because the dot is open and it does not include 4, so it cannot be equal to it.

3) How many cubic feet of water can the
following in-ground swimming pool hold?

Answers

Answer:

Step-by-step

you have to add all hopes this helps

Cameron lives in Charleston, South Carolina. In his research, he found that the population was 10,050 in year 2000 and in 2007, the population was 23,000. What is the predicted population for 2014?

Answers

Answer:

The current population of Charleston, South Carolina is 141,931 based on our projections of the latest US Census estimates. The US Census estimates the 2018

Step-by-step explanation:

Mary needs a board 4 feet and 8 inches long she cut a board 56 inches long is the board mary cut the right length? give a clear and appropriate answer, and tysm for whoever will help me

Answers

Answer:

4 ft 8 inches = 56 inches

Step-by-step explanation:

We know that there are 12 inches in a foot so first convert 4 ft to inches

4 ft = 4*12 = 48 inches

Add the 8 inches left over

48 inches + 8 inches

56 inches

4 ft 8 inches = 56 inches

Select ALL the sets that are the three side lengths of right triangles.

Answers

Answer: It would be C and D

Step-by-step explanation:

By the phythagorean theorem, the 2 legs would equal to the hypothesize.

Choice A would not form a triangle.

Choice B does not follow the pythagorean theorem. 84 plus 16 does not equal 100.

Choice C does. 8 + 121 = 129.

Choice D does. 1 + 3 = 4.

Find the value of x.
135⁰
(7x+2)
x = [?]°

Answers

(7x+2)=135
7x=133
X=19

would be great if someone can help with this.

Answers

Answer:

144

Step-by-step explanation:

In a regular decagon like the one shown in the picture each angle is 144 degrees and it all adds up to 1,440. If you want proof search up "angle of a decagon"

13. The University of Oregon's football team has many different
uniforms. The coach can choose from four colors of jerseys and
pants: green, yellow, white, and black. There are three helmet
options: green, white, and yellow. Also, there are the same four
colors of socks and two colors of shoes, black and yellow.
a. How many jersey/pant combinations are there?
b. If the coach picks a jersey/pant combination at random, what is
the probability he will pick a yellow jersey with green pants?
c. Use a tree diagram to find all of the possible shoe and sock
combinations.

Answers

The dataset of the University of Oregon's football team is an illustration of combination and probability

The number of jersey/pant combination

The given parameters are:

Jersey = 4

Pants = 4

So, the number of jersey/pant combination is:

Combination = 4 * 4

Combination = 16

Hence, there are 16 combinations of jersey/pant

The probability of picking a yellow jersey and green pant

There is only one combination of yellow jersey and green pant from the total of 16 combinations.

So, the probability is:

P = 1/16

Hence, the probability of picking a yellow jersey and green pant is 1/16

The tree diagram

See attachment

From the attachment, we have a total of 8 possible combination of shoe and sock

Answers

The algebraic method for solving simultaneous linear equations is the substitution method

The elimination method is the process of eliminating one of the variables in the system of linear equations using the addition or subtraction methods

What is an equation?

It is defined as the relation between two variables, if we plot the graph of the linear equation we will get a straight line.

The algebraic method for solving simultaneous linear equations is the substitution method. The value of one variable from one equation is substituted in the second equation in this procedure, as the name implies.

The elimination method is the process of eliminating one of the variables in the system of linear equations using the addition or subtraction methods in conjunction with the multiplication or division of coefficients of the variables.

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If a ∝ b and a = 18 when b = 3, then find a when b = 5.

show how you got ur answer so I can see if it makes sense!

Answers

"a ∝ b" means "a is proportional to b", which in turn means there is some constant k such that

a = kb

We're given that a = 18 and b = 3, so that

18 = 3k ⇒ k = 6

Then when b = 5, we would have

a = 6 × 5 = 30

A rectangular garden has vertices at (4, 3), (6, 3), (6, 9), and (4, 9). Plot each vertex of the garden.

Answers

Answer:

Step-by-step explanation:

A rectangular garden has vertices at

(x = 4, y = 3), (x = 6, y = 3), (x = 6, y = 9), and (x = 4, y = 9).

To plot each vertex of the garden find on the graph the x and y coordinate of the point and mark the point.

2. Can vertical angles also be adjacent angles? Explain.

Answers

Adjacent angles are also vertical angles.

see attachment below

Answers

Answer:

144

Step-by-step explanation:

I think.

Janelys needed to get her computer fixed. She took it to the repair store. The technician at the store worked on the computer for 5.75 hours and charged her $168 for parts. The total was $426.75. Write and solve an equation which can be used to determine xx, the cost of the labor per hour.

Answers

Answer: x = 45

Step-by-step explanation:

The equation is 5.75 x + 168 = 426.75 and cost of the labor per hour is 45.

It is required to find the value of x.

What is algebra?

A part of mathematics in which letters and other general symbols are used to represent numbers and quantities in formulae and equations.

Given:

The expression is

5.75 x + 168 = 426.75,

where 5.75x represents the cost of labor per hour, 168 is the cost of the parts, and 426.75 is the total.

According to given question we have,

5.75 x + 168 = 426.75,

Substract 168 from both sides we get,

5.75 x + 168-168 = 426.75-168

5.75x = 258.75

x = 45

Therefore, the equation is 5.75 x + 168 = 426.75 and cost of the labor per hour is 45.

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For fundraiser a student is selling pizza for $5 and subs for $3. the students sold 11 more subs than pizza. he sold a total of $233. many many pizza and subs did he sells

Answers

Answer:

25 pizzas and 36 subs

Step-by-step explanation:

5x+3x=233 --> but there are 11 more subs that pizza, so 11x3 is 33

(5x+3x) +33 = 233

5x+3x= 200

8x=200

x=25

so then 5 dollars by 25 pizzas, and 36 (25+11) subs at 3 dollars = 233$

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