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2 years ago

9

The owner of an electronics store received a shipment of MP3 players at a cost of 64.25 each. If he sells the MP3 players for 99

.99 each, what is the percent of markup

1 answer:

Evgen [1.6K]2 years ago

4 0

It's about a 155.62645% markup. (99.99/64.25)=1.556264591439489, *100 to get percent.

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A chemical flows into a storage tank at a rate of (180+3t) liters per minute, where t is the time in minutes and 0<=t<=60

Yuliya22 [10]

Answer:

The amount of the chemical flows into the tank during the firs 20 minutes is 4200 liters.

Step-by-step explanation:

Consider the provided information.

A chemical flows into a storage tank at a rate of (180+3t) liters per minute,

Let $c(t)$ is the amount of chemical in the take at <em>t </em>time.

Now find the rate of change of chemical flow during the first 20 minutes.

$\int\limits^{20}_{0} {c'(t)} \, dt =\int\limits^{20}_0 {(180+3t)} \, dt$

$\int\limits^{20}_{0} {c'(t)} \, dt =\left[180t+\dfrac{3}{2}t^2\right]^{20}_0$

$\int\limits^{20}_{0} {c'(t)} \, dt =3600+600$

$\int\limits^{20}_{0} {c'(t)} \, dt =4200$

So, the amount of the chemical flows into the tank during the firs 20 minutes is 4200 liters.

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An environmental science teacher at a high school with a large population of students wanted to estimate the proportion of stude

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Step-by-step explanation:

The confidence interval of a proportion is given by:

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Where 'p' is the proportion of students who responded 'yes', 'z' is the z-score for a 95% confidence interval (which is known to be 1.960), and 'n' is the number of students in the sample.

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3 years ago

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Given expression in exponential form : $a^{\frac{4}{9} }$ .

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We can apply following rule:

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