1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kirill [66]
3 years ago
10

Starting with 195 grams of a radioactive isotope, how much will be left after 3 half-lives?

Mathematics
1 answer:
MrMuchimi3 years ago
4 0
After one half-life:  \frac{1}{2}\times 195=97.5 grams.

After two half-lives:  \frac{1}{2} \times 97.5=48.75 grams.

After three half-lives: \frac{1}{2} \times 48.75=24.375 grams.
You might be interested in
What is the slope of the line that passes through the points (-9, -8)((−15,−16)? Write your answer in simplest form.
alexandr402 [8]

Answer:

Therefore the slope of the line that passes through the points (-9, -8),(−15,−16) is

Slope=\dfrac{4}{3}

Step-by-step explanation:

Given:

Let,

point A( x₁ , y₁) ≡ ( -9 ,-8)

point B( x₂ , y₂ )≡ (-15 ,-16)

To Find:  

Slope = ?

Solution:

Slope of Line Segment AB is given as

Slope(AB)=\dfrac{y_{2}-y_{1} }{x_{2}-x_{1} }

Substituting the values we get

Slope(AB)=\dfrac{-16-(-8)}{-15-(-9)}\\\\Slope(AB)=\dfrac{-16+8}{-15+9}\\\\Slope(AB)=\dfrac{-8}{-6}=\dfrac{4}{3}

Therefore the slope of the line that passes through the points (-9, -8),(−15,−16) is

Slope(AB)=\dfrac{4}{3}

4 0
3 years ago
In four years, 40% of a radioactive element decays. Find its half-life. Round to one decimal place.
White raven [17]

To find the answer, use k = \frac{2.303 }{ 4} (log\frac {100 }{ 40}) , and then use the equation t=\frac{.693}{k} To find it's half life.

5 0
3 years ago
Read 2 more answers
Find the volume of the following figure. Round your answer to the nearest whole
PilotLPTM [1.2K]

Answer:

210cm

Step-by-step explanation:

B=l•w

B=5•6

B=30

V=B•h

V=30•7

V=210

8 0
3 years ago
A mass club has 40 members the number of girls is five less than two times the number of boys how many members are boys how many
Lorico [155]

Answer:

15 boys and 25 girls

Step-by-step explanation:

The sum of boys (b) and girls (g) is given as 40:

g + b = 40

The number of girls is 2 times the number of boys minus 5:

2b - 5 = g

First formula can be rewritten as g = 40 - b

Then you can substitute this for g in the second, and you get:

2b-5 = 40-b

Which simplifies to:

2b + b = 40 + 5

3b = 45

b = 15

g = 40-15 = 25

15 boys, 25 girls.

6 0
3 years ago
Solve the right triangle. Round decimals answers to the nearest tenth.
9966 [12]

Answer:

3^2 + x^2 = 9^2

9 + x^2 = 81

x^2 = 72

x = \sqrt{72\\}, which is about 8.5

Cosine X = 3/9

Cosine X = 1/3

angle x= 70.5

If angle x= 70.5, angle z = 19.5 degrees.

Let me know if this helps!

5 0
2 years ago
Read 2 more answers
Other questions:
  • SOMEONE PLEASE ANSWER ASAP FOR BRAINLIEST!!!!!
    6·1 answer
  • Simplify 7 – (–12) – 5
    13·1 answer
  • A closet contains 10 pairs of shoes. if 8 shoes are randomly selected, what is the probability that there will be
    14·1 answer
  • A $1,500 loan has an annual interest rate of 4.25% on the amount borrowed. How much time has elapsed if the interest is now $127
    14·1 answer
  • Multiply both sides of the original equation by x, and find the solution set of the new equation.
    9·1 answer
  • A boy is n years old. His sister is four times as old. The sister's age is
    15·1 answer
  • Money off coupons have been circulated to 300 households. Only 2/5 of these were redeemed(used) in the local supermarket to get
    11·1 answer
  • Find the probability that a randomly-chosen ninth grader will be absent 2 days next month.
    9·1 answer
  • Which describes the shape of the distribution of total points in Mr. Price's science class? Please help ​
    10·1 answer
  • Write an equation for the description.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!