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kondor19780726 [428]
3 years ago
11

As a water quality assurance employee for your local Aqua America, Inc., branch, you record a drop in water levels from 28 feet

to 7 feet at your reservoir. What is the percentage decrease?
Mathematics
1 answer:
ioda3 years ago
3 0
So, it went down from 28 to 7, meaning 28 - 7 = 21, 21 feet then.

now, if we take 28 to be the 100%, what is 21 off of it in percentage?

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
28&100\\
21&p
\end{array}\implies \cfrac{28}{21}=\cfrac{100}{p}\implies p=\cfrac{21\cdot 100}{28}
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The product of two rational numbers is irrational.
PtichkaEL [24]

Answer:

The statement is false.

Step-by-step explanation:

Here we need to remember some things:

Integer numbers are closed under multiplication.

This means that for two integers a and b, the product a*b is also an integer.

A rational number is a number that can be written as the quotient of two integer numbers.

An irrational number is a number that can't be written as the quotient of two rational numbers.

Now let's see the statement:

"The product of two rational numbers is irrational."

The product of two rational numbers is written as:

\frac{a}{b} *\frac{c}{d}

Where a, c, b, and d are integers.

We can rewrite that product as:

\frac{a*c}{b*d}

Because of the first property, we know that a*c is an integer, and b*d is also an integer, so here we have a quotient of two integer numbers, so this is a rational number.

Then the product of two rational numbers is a rational number.

Then the statement is false.

7 0
3 years ago
Joni has a box that a mass of 67 dekagrams she converts this to centigrams her work is shown below
7nadin3 [17]
<h3>✽ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ✽</h3>

➷ Joni should have multiplied by 1000 because 1 dekagram is equal to 1000 centigrams.

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

4 0
4 years ago
Read 2 more answers
Can someone please give the right answer I’ll give brainliest
larisa86 [58]

Answer: You have to multiply the numbers! You can just use a a calculater . length x width x height

Step-by-step explanation:

6 0
3 years ago
Which symbol can be used to correctly compare the two fractions? Use &gt; , &lt; , or =. Enter your answer in the box. 75100 34
Bad White [126]

75100 > 34

75100 is greater than 34

4 0
3 years ago
Corey needs 24 boards that ate 47 1/ 2 inches long. How many feet of boards should he buy. Explain
Illusion [34]
If each board is going to be 47 and 1/2 inches long, and there'll be 24 of them, then their total is just their product.

keep in mind that there are 12 inches in 1 foot.

\bf 24\cdot 47\frac{1}{2}\implies 24\cdot \cfrac{47\cdot 2+1}{2}\implies 24\cdot \cfrac{95}{2}\implies \cfrac{24}{1}\cdot \cfrac{95}{2}\implies \cfrac{2280}{2}&#10;\\\\\\&#10;\stackrel{inches}{1140}\implies 1140~\underline{in}\cdot \cfrac{ft}{12~\underline{in}}\implies \cfrac{1140~ft}{12}\implies 95~ft
8 0
3 years ago
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