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3 years ago

Keith bought a video game for $660. Amy only spent 1/3 of the cost on hers. How much did Amy spend on her video game system?

Mathematics

1 answer:

Virty [35]3 years ago

5 0

Answer:

$220

Step-by-step explanation:

a.) 1/3 (660) = $220

b.)

1/3 = x/660

3x=660

x=660/3

x=220

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Element X is a radioactive isotope such that its mass decreases by 26% every day. If an experiment starts out with 810 grams of

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Answer:

The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

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Step-by-step explanation:

Exponential equation of decay:

The exponential equation for the amount of a substance is given by:

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In which A(0) is the initial amount and r is the decay rate, as a decimal.

Hourly rate of change:

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The hourly decay rate is of 1.25%, so the hourly rate of change is of -1.25%.

Starts out with 810 grams of Element X

This means that $A(0) = 810$

Element X is a radioactive isotope such that its mass decreases by 26% every day.

This means that we use, for this equation, r = 0.26.

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$A(t) = 810(1 - 0.26)^t$

$A(t) = 810(0.74)^t$

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