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never [62]
3 years ago
12

A chemist begins with 120 mL of a radioactive substance that decays exponentially. After 24 hours, only 30 mL of the substance r

emain. How many mL will remain after 48 hours? 12.5 mL 7.5 mL 4.5 mL 9.5 mL
Mathematics
1 answer:
alisha [4.7K]3 years ago
6 0

Answer:

7.5 mL

Step-by-step explanation:

If it decays exponentially then you divide the previous number by 4 to get the next number and 30 divided by 4 is 7.5mL.

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creativ13 [48]
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Solving for x gives x = 260.

Thus, the autograph of the basketball player was worth only $260 last year. 

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Write a proof that shows how 45 and 4.5 have a factor of 10
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Answer:

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Step-by-step explanation:

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3 years ago
X - y = -2<br> y = -x - 2<br> What is the solution
LenKa [72]

Answer:

<em>x </em>= -2

<em>y </em>= 0

Step-by-step explanation:

Pretty hard process, but let me explain:

First, solve for y.

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Then, simplify both sides of the equation.

x - y = -2

x - (-x - 2) = -2

After, add -2 to both sides of the equation.

2x + 2 = -2

2x + 2 + -2 = -2 + -2

Next, divided both sides by 2.

2x/2 = -4/2

After that, substitute -2 for x in y = -x - 2:

You must simplify both sides of the equation.

y = -x - 2

y = -(-2) - 2

y = 0

Sorry if this is long and confusing, but I hope this helps!!

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