1. Simplify the following expression: 4a - 5 + 3a - b - 3 + 2b

2. Evalute the expression if a=3 and b=7

Answer:

Jajkmama

Step-by-step explanation:

Answer:

the answer is obtuse. B. I hope this helps you!

Answer:

it is obtuse

Step-by-step explanation:

Answer:

D. The graph of y = |x| – 4 is the same as y = |x|.

Step-by-step explanation:

The graph y=|x|-4 is obtained from the graph y=|x| dy moving down 4 units the graph y=|x|  along the y-axis (see, if x=0, then for y=|x|, y=0 and for y=|x|-4, y=-4).

These two graphs have the same form.

...................................................................................................................................................

The graph of y=|x|-4 is the same as y=|x|.

Answer:

[tex] \frac{x^{2} + 19x - 56}{4 {x}^{2} - 32x} [/tex]

Step-by-step explanation:

Start by making the denominators of both fraction the same. This can be done by multiplying one fraction's denominator by the other.

After simplifying and combining the two fractions together, check if the numerator can be factorised such that there is a common factor in the denominator and numerator. In this case, the numerator cannot be factorised.

Lastly, expand the denominator.

[tex] \frac{x + 7}{4x} + \frac{5}{x - 8} [/tex]

[tex] = \frac{(x + 7)(x - 8)}{4x(x - 8)} + \frac{5(4x)}{4x(x - 8)} [/tex]

[tex] = \frac{x(x) + x( - 8) + 7(x) + 7( - 8) + 20x}{4x(x - 8)} [/tex]

[tex] = \frac{ {x}^{2} - 8x + 7x - 56 + 20x }{4x(x - 8)} [/tex]

[tex] = \frac{ {x}^{2} + 19x - 56}{4x(x - 8)} [/tex]

[tex] = \frac{ {x}^{2} + 19x - 56}{4 {x}^{2} - 32x} [/tex]

7:3

Step-by-step explanation:

Answer:

2(x-5)=9

Step-by-step explanation:

x is used for "a number"

Answer:

$85

Step-by-step explanation:

(if you need to explain how the anwer was gotten)

34 ÷ 4 = 8.5

8.5 × 10 = 85

Answer:

ten

Step-by-step explanation:

I hope this helps!!!!!!!!!

x=3

本题已由中国数学会官方解答（现有会员：3人）  

The solution is, the value of x = 3.

Logarithm, the exponent or power to which a base must be raised to yield a given number. The quotient rule says that, the logarithm of a quotient is equal to a difference & the product rule says that logarithm of product is equal to the sum of logarithm.

here, we have,

given that,

2 In e^(ln 5x) = 2 In 15

now, we have to solve it for x.

we know that,

e^(ln 5x) = 5x

using the rule of logarithm.

so, we have,

2 In (5x) = 2 In 15

now, for solving,

comparing both sides, we get,

15 = 5x

i.e. x = 15/5

or, x = 3

Hence, The solution is, the value of x = 3.

To learn more on Property of Logarithm click:

brainly.com/question/10418010

#SPJ7

Answer:

1 because you just move the decimal places two times to the left!

Hope this helps :D

Answer:

130 degrees

Step-by-step explanation:

A triangles angles have to equal 180 degrees

A right angle = 90 degrees

40+90=130

180-130=50

A straight angle has to equal 180 degrees

180-50=130

130 degrees

Answer:

Step-by-step explanation:

Slope: -3

y-intercept: -2 (y-intercept is where a line cross the y-axis, vertical line)

Pencil on the y-intercept, three down and one to the right, then trace the line from -2 on the y-axis.

Answer:

-9

Step-by-step explanation:

The slope of the the solving equation is triple the slope of the given equation. Therefore, the y coefficient must also be triple of the other y coefficient.

The equation is,  [tex]\rm y = 30(1+0.50)^x[/tex]  101.25 bacteria cells after 3 hours, and 3892 bacteria cells after 12 hours  will be present,

It is given that the sample of bacteria cells in a petri dish increases by 50% every hour, a scientist starts with a sample of 30 bacteria cells.

It is required to find the equation that can be used to determine the number of cells after x hours.

It is defined as increasing an amount by a definite percentage over the span of a time, the original amount increases exponentially.

We know the Exponential Growth equation written as:

[tex]\rm y= a(1+r)^t[/tex]

Where y = total amount,

           a = starting amount

           r = the growth rate/exponential decay rate as a decimal

           t = number of growth periods.

We have a = 30

               r = 50% = 0.50

               t = x

Putting these values in the Exponential Growth equation, we get:

[tex]\rm y = 30(1+0.50)^x[/tex]  this is the equation for Exponential Growth.

If x = 3 hours, then:

[tex]\rm y = 30(1+0.50)^3 \Rightarrow 30(1.50)^3\Rightarrow 30(3.375)\Rightarrow 101.25\\[/tex]

If x = 12 hours, then:

[tex]\rm y = 30(1+0.50)^1^2 \Rightarrow 30(1.50)^1^2\Rightarrow 30(129.746)\Rightarrow 3892.39\approx 3892[/tex]

Thus, the equation that can be used to determine the number of cells after x hours is,  [tex]\rm y = 30(1+0.50)^x[/tex], that 101.25 bacteria cells will be present in the dish after 3 hours, and 3892 bacteria cells will be present after 12 hours.

Learn more about Exponential Decay here:

brainly.com/question/2193820

Answer:

1). y=30(1+.50)^x

2). 101.25

3). 3,892.39 Bacteria cells

Step-by-step explanation:

Answer:

René Descartes

Step-by-step explanation:

N/A, too simple of a question.

Answer:

filósofo René Descartes.

El plano cartesiano lleva el nombre del matemático y filósofo francés René Descartes (1596-1650), quien introdujo el sistema de coordenadas para mostrar cómo se podía usar el álgebra para resolver problemas geométricos.

The new equation will be [tex]y=-1.5x+75[/tex]

Since the height at 0 seconds will be 75, it means that 15 has been added to the height at each time instant.

As a result, the gradient will remain [tex]-1.5[/tex], but the y-intercept will become 75. Therefore the equation will only change at the intercept.

The new equation will be [tex]y=-1.5x+75[/tex]

Learn more about slopes and intercepts: https://brainly.com/question/1201010

Answer:

216 -18-18= 180 /2= 90

Step-by-step explanation:

thus is how I figured it out cause 2 aides of a rectangle are the same so it would leave the other 2 sides as equal too

Answer:

(-2,17) i think i am not sure

Step-by-step explanation:

Answer: The answer would be C, 1/3

Step-by-step explanation:

If you turn each proportion into a fraction and simplify each fraction, they would all simplify to 1/3. Hope this helps.

Answer:

216,000

Step-by-step explanation:

Answer:

the ratio should be 4.754

Step-by-step explanation: ez kiddo i have the answer key

Answer:

D

Hope it helps!

Answer:

It would make 7 batches of chocolate cake

Answer:

2.6

Step-by-step explanation:

Could you mark this the brainlist

Answer:

2.5 or 2 1/2 ft is the width

Step-by-step explanation:

Area of rectangle = length × width

(13 3/4 can also be written as 13.75)

(5 1/2 can also be written as 5.5)

Area = l × w

13.75 = 5.5 × w

13.75 ÷ 5.5 = w

2.5 = w

Answer:

(5, -3)

Step-by-step explanation:

(0, -5)

Step-by-step explanation:

Since we are given the slope and a point on the line, we can use these to write the point-slope form of the equation of the line, which looks this this:

[tex]y - y_1 = m(x - x_1)[/tex]

where [tex](x_1, y_1)[/tex] is the point on the line and m is the slope. So the equation has the form

[tex]y - 4 = 3(x - 3)[/tex]

To find the y-intercept, set x = 0 to get

[tex]y - 4 = 3(0 - 3) \Rightarrow y - 4 = -9[/tex]

Solving for y, we get

[tex]y = -5[/tex]

Therefore, the coordinates of the y-intercept is (0, -5).

Answer:

hope this helps and u understood it

check the steps in the picture attached

Answer:

15 bottles are left

Step-by-step explanation:

we say:

20 bottles

- 5 bottles

15 bottles

Answer:

15

Step-by-step explanation:

20 - 5 = 15

Answer:

959/1000

Thank me later and for asking! :))

Answer:

Step-by-step explanation:

0.959 as a fraction and percent expansion provides the details of what is the equivalent fraction and percent for decimal 0.959, and the answer with steps to understand how it is being calculated.

0.959 as a Fraction

0.959 = (?)

= (0.959/1) x (1000/1000)

= 959/1000

0.959 = 959/1000

0.959 as a fraction equals to 959/1000  

Hope this helps :)

Multiply number of cans by price per can:

4 x 11.50 = 46

They need $46

Answer:

$46

Step-by-step explanation:

Cuz im Smart