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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 />

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Jim spent $46.16 on some mulch and one shovel. Each bag of mulch costs $3.49 and the shovel cost $14.75. How many bags of mulch
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To find the amount he spent on bags of mulch you must take the cost of the shovel away from the total, giving the equation:
46.16-14.75=3.49x
To covert this to whole numbers, multiply by 100
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You measure the length of a flower garden to be ten 2​-foot paces. A tape measure gives the actual length as 17.1 feet.
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Answer:

2.9 feet

Step-by-step explanation:

ten 2-foot paces

= 10 x 2

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Actual length

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Difference

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2 years ago
Based on the data in this two-way table, if a flower is picked at random, what is the probability of getting a yellow flower?
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3 years ago
Read 2 more answers
What is the equation of the circle with center (-3,1) that passes through the point (-5, 3)?
Natali5045456 [20]

Answer:

Option B) (x + 3)^2 + (y – 1)^2 = 8 is the correct answer.

Step-by-step explanation:

The equation of a circle with center (h,k) and radius r is given by:

(x-h)^2 + (y-k)^2 = r^2

Given

Center = (h,k) = (-3,1)

=> h = -3

=> k = 1

The distance between the center of circle and the point through which the circle passes will be the radius.

The distance formula is given by:

r = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2

Given

(x_1,y_1) = (-3,1)\\(x_2,y_2) = (-5,3)

Putting the values in the formula

r = \sqrt{(-5+3)^2+(3-1)^2}\\r = \sqrt{(-2)^2+(2)^2}\\r = \sqrt{4+4}\\r = \sqrt{8}

Putting the values of h,k and r in general form of equation

\{x-(-3)}^2\} +(y-1)^2 = (\sqrt{8})^2\\(x+3)^2+(y-1)^2 = 8

Hence,

Option B) (x + 3)^2 + (y – 1)^2 = 8 is the correct answer.

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How many strings of eight english letters are there
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