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
nirvana33 [79]
3 years ago
15

The half-life of uranium-235 is 700 million years. If you start with 50 atoms of it, how many will you have left after 700 milli

on years?
A. 50
B. 100
C. 25
D. 45
Mathematics
2 answers:
Alecsey [184]3 years ago
8 0
The answer is
A half life pertains to the time it takes for exactly half of a substance to disappear. So, if U235 has a half life of 700 million years, it will take 700 <span>million years for half of it to decay. That would leave .5kg or 500g.</span>
Ksju [112]3 years ago
8 0

Answer:

A 50

<em>i just guess for this answer but i don't really know if it right or not.</em>

<em />

You might be interested in
Pamela drove her car 99 kilometers and used 9 liters of fuel. She wants to know how many kilometers (k) she can drive with 12 li
masya89 [10]

Answer:

132 kilometers

Step-by-step explanation:

Given: Pamela drove her car 99 kilometers and used 9 liters of fuel.

To find: Number of kilometers Pamela drove in 12 liters of fuel.

Solution:

It is given that Pamela drove her car 99 kilometers and used 9 liters of fuel. Also the relationship between kilometers and fuel is proportional.

So, let us assume that she can travel x kilometers in 12 liters of fuel.

By proportionality we have,

99:9 :: x:12

\frac{99}{9} =\frac{x}{12}

11=\frac{x}{12}

x=12\times11

x=132

Hence, she can travel 132 kilometers in 12 liters of petrol.

7 0
3 years ago
Read 2 more answers
PLEASE HELPS!!!!!!!!!!!!!!!!!!!!!!! I WILL GIVE BRAINLIEST AND EXTRA POINTS!!!!!!!!!!!!!!!!!!!!!
Verizon [17]

Answer:

Yes

Yes

No

No

Step-by-step explanation:

7 0
3 years ago
Helena wants to paint a box in the shape of a cube with sides that are 18 inches long. what is the surface area that Helena will
yan [13]

Answer:

1944 Inches Squared

Step-by-step explanation:

Surface area Formula for a Cube:

A = 6a^2

The "edge", which is also the side, is 18 inches.

a = 18

Solve the formula.

A= 6a^2 = 6(18)^2 = 6 * 18^2\\18^2 = 324\\324 * 6 = 1944\\A=1944

The cube's surface area should be 1944 square inches.

5 0
3 years ago
a square lawn has a perimeter of 36 meters and a circular exercise run has a circumference of 36 meters which shape will give ri
neonofarm [45]

Answer:

The square lawn.

Step-by-step explanation:

This is because a perimeter of 36 meters means that it is 81 ft^2 of total area.

A circle of 36 meters means that it would be 36/2\pir, which would be smaller that 81 ft^2.

4 0
3 years ago
Read 2 more answers
How many 3-digit numbers can you write using only the digits 1 and 2?
defon
For the first digit, you have two possible choices: 1 or 2. For *each* of those choices, you can choose 1 or 2 for the second digit in the number, and for each of *those*, you can choose 1 or 2 for the third digit of the number.

That’s 2 * 2 * 2 or 8 possible 3-digit numbers you can make with the digits 1 and 2.
4 0
3 years ago
Other questions:
  • There are 40 girls and 60 boys in the math club the coach wants to divide the entire club into teams where each team has the sam
    9·1 answer
  • A store manager wishes to reduce the price on her fresh ground coffee by mixing two grades. If she has 35 pounds of coffee which
    9·2 answers
  • HURRY!!!!!!!!!!!!!Which equation represents g(x)?
    13·2 answers
  • Given the two sets:
    13·1 answer
  • Help me on this question pls!
    8·2 answers
  • A lawn mower cost $470 when new and is expected to last 10 years. What will it be worth in 7.5 years? (Assume the lawn mower has
    5·1 answer
  • If $5000 is invested at a rate of 3% interest compounded quarterly, what is the value of the investment in 5 years?
    10·1 answer
  • What is the fraction of 1/2+1/3=
    13·2 answers
  • What is the most common amount of hours students spent studying? (2 points)
    11·1 answer
  • Which rational exponent represents a square root?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!