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2 years ago

11

Regina leased a car for $380 per month. Her new lease is $475 per month. What is the percent increase in the monthly cost of her

lease?

2 answers:

sergeinik [125]2 years ago

8 0

Answer: 3

Step-by-step explanation:

maks197457 [2]2 years ago

6 0

Answer:

25

Step-by-step explanation:

25

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A scientist has 100 milligrams of a radioactive element. The amount of radioactive element remaining after t days can be determi

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The mass of the first shipment at time t is
$m_{1}=100( \frac{1}{2} )^{ \frac{t}{10}}$

The mass of the second shipment at time t is
$m_{2}=100( \frac{1}{2} )^{ \frac{t-3}{10} }$

At time t, the ratio of m₁ to m₂ is
$\frac{m_{1}}{m_{2}} = \frac{100}{100}. \frac{(1/2)^{t/10}}{(1/2)^{(t-3)/10}} \\ = \frac{(1/2)^{t/10}}{(1/2)^{t/10}}. \frac{1}{(1/2)^{-3/10}} \\ = (1/2)^{3/10} \\ = 0.8123$

Therefore as a percentage,
$\frac{m_{1}}{m_{2}} =100*0.8123 = 81.23 \%$

Answer: B. 81.2%

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