Mathematics College

12. An initial amount of 100 grams of the radioactive isotope thorium-234 decays according
to
A(t) = 100e^-0.02828t
where t is in years. How long will it be before half of the initial amount has disinte-
grated?

Answers

Answer 1

Answer:

Radioactive half-life An initial amount of 100 g of the radioactive isotope thorium-234 decays according to Q ( t ) = 100 e − 0.02828 t where t is in years.

Step-by-step explanation:

Related Questions

4. Find the slope and y-intercept of the line 5x – 8y = -20.

Answers

Answer:

Slope is 5/8.

y-intercept is (0, 5/2)

Step-by-step explanation:

Answer:

this is what u need to do

Step-by-step explanation:

first you need to put it into this

[tex]y=mx+b[/tex]

so this is what is next

[tex]y=-8(5x)-20[/tex]

[tex]y=5x+12[/tex]

Can u please help me!

Answers

Answer:

1st one is 20  2nd one is 21

Step-by-step explanation:

Answer:

1: 20

2: 21

im not to sure tho

Evan has $0.45 worth of pennies and nickels. He has a total of 21 pennies and nickels altogether. Determine the number of pennies and the number of nickels that Evan has.​

Answers

6 nickels and 15 pennies
6 nickels and 15 pennies

A waffle house offers 19 different types of syrups. If a customer can choose any number of syrups to have with their waffle, how many syrup combinations are possible? Please show work

Answers

Answer:

Step-by-step explanation:

they all just have 19 or less

If the two variables in a given theory move in the same direction, which type of relationship do they share?
A negative
B. positive
C. neutral
D.l inverse​

Answers

Using proportionality of variables, it is found that they are classified as positive, hence option B is correct.

What is the proportionality of variables?When two variables move in the same direction, their relation is called direct or positive.When two variables move in the different directions, their relation is called inverse or negative.If they are independent, they are neutral.

In this problem, they move in the same direction, thus they are classified as positive and option B is correct.

More can be learned about proportionality of variables at https://brainly.com/question/1266676

Answer:

positive

Step-by-step explanation:

Original Price = $ 120, %Markup = 4%

So what’s the price?

Answers

Answer:

124.8

Step-by-step explanation:

120*.04=124.8

4. What is the solution to the system of equations?

5. What is the solution to the system of equations?

6. Explain how to solve the previous problem # 5

Photo is attached

Answers

Answer:

5 and 6

Step-by-step explanation:

Please help I’ll mark you as brainiest

Answers

Answer:

V = 10 x 9 x (1/3)

V = 30 in³

Step-by-step explanation:

Please help
TIME REMAINING
57:49
What is the lowest value of the range of the function
shown on the graph?

-♾
-2
0
3

Answers

Answer:

it looks like its negative 2

Answer:

it's -2.

you probably don't want a explanation but in case someone asks you about it just tell them that "range" is the area from up to down and they're asking for the lowest value.

Today I am trying to change peoples' days for the better. Say something nice in the comments, or answer this "question", whether it's an inspirational quote, poem, picture, or simple 'hi'. I want to make your day, so answer this question, and take my points. Keep Shining!!! Love you all :)

Answers

Answer:

Hello! Thank you a lot! My nice thing would have to be keep going even when things get hard. We all have something unique about us and were all on a journey to figure out what that is. Don't let anyone take away what makes you unique.

Step-by-step explanation:

convert to slope form: 3x-4y=8 then graph the line on the grid.​

Answers

Answer: 3/4

Step-by-step explanation:

Graph the line using the slope and y-intercept, or two points.

Slope: 3/4

HOPE THIS HELPS :)

Please help me, I don’t know how to solve for x on this one

Answers

Use trigonometry to solve for x.

The tangent function is defined to be opposite side divided by the adjacent side.

tan(78) = x/10

tan(78)(10) = x

47.0463010948 = x

We now round off to two decimal places. In other words, we round off to the nearest tenths.

47.05 = x

Done!

Wich one is SAS
Please helpppp

Answers

Answer: AD=DC

Step-by-step explanation:

All you have to do is divide 132,000 by 53%.. =69,960

Answers

Answer: 69,960  divide  132,000 by 53%  you get 69.960

Step-by-step explanation:

 

1/4x-3/4=7/x solving the following rational equation for x

Answers

Answer:

x¹= -4 , x²= 7

Step-by-step explanation:

1) Determine the defined range

¼x-¾=7/x =/ 0

2) Move the expression to the left-hand side and change its sign

[tex] \frac{1}{4} x - \frac{3}{4} - \frac{7}{x} = 0 \\ \\ [/tex]

3) Write all numerators above the least common denominator 4x

[tex] \frac{ {x}^{2} - 3x - 28 }{4x} = 0[/tex]

4) When the quotient of expressions equals 0, the numerator has to be 0

x²-3x-28=0

5) Write -3x as a difference

x²+4x-7x-28=0

6) Factor out x from the expression

x(x+4)-7x-28=0

7) Factor out -7 from the expression

×(x+4)-7(x+4)=0

8) Factor out x+4 from the expression

(x+4)×(x-7)=0

9) When the product of the factors equals 0, at least one factor is 0

x+4=0

x-7=0

10) Solve for the x

x+4=0 -> x= -4

x-7=0 -> x=7

11) Check if the solution has defined range

x= -4

x=7

12) The solution has 2 solutions

[tex]x1 = - 4 \: \: x2 = 7[/tex]

Answer:

The correct answer is -9

Joyce paid $60.50 for an item at the store that was 45 percent off the original price. What was the original price?

Answers

Answer:

27.23

Step-by-step explanation:

60.50 divided by .45

Two complementary angles are congruent. Which equation gives the measure in degrees, d, of each angle? (Imagine math)

Answers

Answer:

sksi

Step-by-step explanation:

Answer:

5x-8x=y

Step-by-step explanation:

Match each complex number with its corresponding distance to the origin.

Answers

Answer:

no

Step-by-step explanation:

bc im better

Please answer all three and I am giving brain thing and Max points

Answers

Answer: its a blank page

Step-by-step explanation:

If prepresents the number of pizzas ordered, and srepresents the number of slices per pizza, then what does ps ⋅ repre

Answers

Answer:

Let us assume here, in this situation that each page has the same weight so if i want to find the weight of the complete stack, i will multiply the number of sheets of paper by the weight of a single sheet of paper.

Step-by-step explanation:

Grace has 2 quartera . Jen have 4 dimesss were ans 1 nickels. Keesha has 3 dimes and 3 nickels. Terry has 1 quarters , 1 dime

Answers

What is this supposed to mean? And what is the question? If I read it correctly, Grace has 50 cents, Jen has 45 cents, Keesha has 45 cents and terry has35 cents

y = 3x - 4
y =- 1x +4

Answers

I’m thinking this is a systems of equations so here’s how you do it. Hope it helps!!!!

If A = {x | x is an odd integer), B = {x | x is an even integer), C = {2,3,4,5), and D = {3,4,5,6), list the element(s) of the following set.

Answers

Answer:

Answer: 3,4,5,6 can be the complete list for the f(x).

Step-by-step explanation:

Given a polynomial function f(x) which is a fourth degree polynomial .Therefore it must has 4 roots.

Let's check all the options for the possible list of roots of f(x)

1) 3,4,5,6 can be the complete list for the f(x) .

Option 2) and option 3) cannot be the complete list for the f(x) as it has one complex root and complex roots occur in pair.

Option 4) cannot be the complete list for f(x) as complex roots occur in pair and they conjugates but conjugate of 5+i is 5-i(which is not given) not -5+i

Write the equation in slope-intercept form that passes through (-1,-7) and (1,3)

Answers

Answer:

y= -2x + 5

Step-by-step explanation:

Using the two points you get the slope: -2

Using the slope and one of the given points, you can find out the y-intercept, which is 5  

hey! how are y'all? tell me about your day:)

Answers

hey! i’m doing okay , hmm i didn’t do much today’s besides go to school obviously

Answer:

Hi, I'm doing good, just bored

52 songs on 4 cds
ASAPAPAAPAPAPA

Answers

Answer:

Is it a question

Step-by-step explanation:

Seriously!!!

simplify expressions with distribution
8x – 6(-6x + 4)

Answers

Answer:

44x-24

Step-by-step explanation:

Distribute

Answer:5

Explanation:8x-6=6x+4

8x-6x=6+4

2x=10

x=5

find the difference in altitude between a mountain that has an altitude of 4878 feet and a desert valley that is 428 feet below sea level.

Answers

Answer:

4450 I think

Step-by-step explanation:

4878-428=4450

The difference in altitude and desert valley is 53.06 feet.

What is Integer?

Integers come in three types:

Zero (0)Positive Integers (Natural numbers)Negative Integers (Additive inverse of Natural Numbers)

Given:

The desert valley that is 428 feet below sea level is (-428).

and, altitude of 4878 feet  is (+4878) feet.

So, the difference is

= 4878 - (428)

= 4878 + 428

= 5306 feet

Hence, the difference is 5306 feet

Learn more about Integers here:

https://brainly.com/question/15276410

#SPJ2

which equation can be used to find 60 percent of 50?​

Answers

Answer:

the answer is [c]

60 percent as a decimal is 0.6 (60/100) so to find 60 percent of 50 you do 50 * 0.6 and you’ll get 30

IT IS FOR 100 POINTS
Which description is paired with its correct expression?

four less than the quotient of a number cubed and seven, increased by three; 4 minus StartFraction n cubed Over 7 EndFraction + 3 five times the difference of a number squared and six; 5 (6 minus n squared) nine more than the quotient of six and a number cubed, decreased by four; 9 + StartFraction n cubed Over 6 EndFraction minus 4 twice the difference of nine and a number squared; 2 (9 minus n squared)

Answers

Answer:

See below

Step-by-step explanation:

I think it’s four less than the quotient of a number cubed and seven, increased by three

I hope you get this right!

Answer:

I think it’s four less than the quotient of a number cubed and seven, increased by three

Step-by-step explanation:

hope this helps

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