90% off original price! The original price of a calculator is $40. What is the sale price?

Mathematics

2 answers:

jekas [21]4 years ago

7 0

Answer:

it is 4 dollars off

Step-by-step explanation:

40/10=4 and since it's 90% off, we multiply 4 x 9.

4 x 9 = 36. 40 - 36 = 4.

marissa [1.9K]4 years ago

4 0

Answer:

that answer is 4

Step-by-step explanation:

divide the percent by 40 and you get 4

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A rectangle swimming pool is 8 feet deep. One side of the pool is 4.5 times longer than the other. The amount of water needed fo

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The side lengths of the pool 10 ft and 45 ft.

<u>SOLUTION: </u>

Given, a rectangle swimming pool is 8 feet deep.

One side of the pool is 4.5 times longer than the other.

Let the length of pool be n feet, the width will be 4.5n feet

The amount of water needed for the swimming pool is 3600 cubic ft

We have to find the dimensions of the pool. Now, we know that,

$\begin{array}{l}{\text {volume of pool}=\text {depth} \times \text {length } \times \text {width}} \\\\ {\rightarrow 3600 \text { cubic } f t=8 \text { feet } \times \text { n feet } \times(4.5 n) \text { feet }} \\\\ {\rightarrow 8 n \times 4.5 n=3600} \\\\ {\rightarrow 36 n^{2}=3600} \\\\ {\rightarrow n^{2}=100}\end{array}$