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asambeis [7]
3 years ago
5

As a water quality assurance employee for local Aqua America, Inc branch record a drop in water levels from 28 feet to 7 feet at

your reservoir. What is your percentage decrease?
Mathematics
2 answers:
Bad White [126]3 years ago
8 0
7 is 1/4 of 28, so 7 is 25% of 28.
The drop from 28 to 7 is a drop of 21.
21 is 3 times 7, so 21 is 3 times 25%.

Answer: It is a 75% decrease.
Veseljchak [2.6K]3 years ago
5 0

Answer:

Percentage decrease in the reservoir level is 75%.

Step-by-step explanation:

Initial level of the water in the reservoir was recorded = 28 feet

Level of water at the reservoir after the drop = 7 feet

Decrease in the water level = (28 - 7) = 21 feet

Now to calculate the percentage drop we will apply the formula,

Percentage change = \frac{\text{Net change}}{\text{Initial level}}\times 100

= \frac{21}{28}\times 100

= 75%

Percentage decrease in the reservoir level is 75%.

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Write the doubles plus one fact for 7+7.
Pie

Answer:

7 + 8 = 7 + 7 + 1.

Step-by-step explanation:

We know that, 'double plus one facts' is used to make the addition of numbers easy.

For e.g. we have 8 + 9 = 17. This addition can also be done as 8 + 8 + 1 = 17 i.e. we write first term twice and add 1 to get the result.

Hence, we give the name to this type of addition as 'double plus one'.

Now, we have to use this fact for 7 + 7.

So, we consider 7 + 8 = 15.

Therefore, 7 + 8 can be written as 7 + 7 + 1

Hence, the double plus one facts for 7 + 7 is 7 + 8 = 7 + 7 + 1.

7 0
3 years ago
Read 2 more answers
3. Which expression is equivalent to 1+2(x-1)
padilas [110]

Answer:

<em>2x - 1</em>

Step-by-step explanation:

<u>Equivalent Algebraic Expressions </u>

One algebraic expression can be written in several ways by applying known rules and theorems that modify expressions without changing its final value.

The expression:

1 + 2(x - 1)

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Multiplying the constant by the contents in parentheses:

1 + 2x - 2

Collecting like terms:

-1 + 2x

Or, equivalently:

2x - 1

8 0
2 years ago
Simplify,write equivalent expressions. 1/6(15a+20b)
lutik1710 [3]
1/6* (15a+20b)
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6 0
3 years ago
A force of 84N is applied to an area of<br> 15cm". Work out the pressure in N/cm².<br> cm3)
Tcecarenko [31]

Answer:  5.6 N/cm^2

============================================

Work Shown:

Pressure = (Force)/(Area)

P = F/A

P = (84 N)/(15 cm^2)

P = (84/15) (N/cm^2)

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For every square cm, 5.6 newtons of force is applied.

-------------

Extra info:

If you wanted to convert this to pascals, then you would need to convert 15 cm^2 to 0.0015 square meters. Then apply the formula above to get 56,000 pascals. 1 pascal is equivalent to 1 N/m^2.

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The equation of the line is y = 3x - 4, so the inequality is y <= 3x - 4.

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