1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
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%.

You might be interested in
An open box is to be made out of a 6-inch by 14-inch piece of cardboard by cutting out squares of equal size from the four corne
lawyer [7]

Answer:

The dimensions of the resulting box that has the largest volume is 1.3 inches x 1.3 inches

Step-by-step explanation:

Card board size is L= 14 inches and

W = 6 inches

Let x be the size of equal squares cut from 4 corners and bent into a box whose size is now;

L = 14 − 2x , W = 6 −2x and h = x inches.

Volume of the box is given as;

V = (14 −2x)(6−2x)x

V =(4x² − 40x + 84)x

= 4x³ − 40x² + 84x.

Now, for the maximum value,

dV/dx =0

Thus,

dv/dx = 12x² - 80x + 84 = 0

Using quadratic formula

x = [-(-80) ± √(-80²) - 4(12 x 84)]/(2 x 12)

x = [80 ± √(6400 - 4032)]/24

x = (80 + 48.66)/24 or (80-48.66)/24

x = 5.36 or 1.31

Looking at the two values, 1.31 would be more appropriate because if we use 5.36,we will get a negative value of the width (W).

Thus, x = 1.31 inches

Let us use the Second Derivative Test to verify that V has a local maximum at x = 1.31.

Thus;

d²v/dx² = 24x - 80 = 24(1.31) - 80 = -48.56

This is less than 0 and therefore, the volume of the box is maximized when a 1.31 inch by 1.3 inch square is cut from the corners of the cardboard sheet.

3 0
3 years ago
Which of the following lists the order of operations in the correct order?
love history [14]

Answer:

whats the list

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
Which figure represents the image of parallelogram LMNP
Naya [18.7K]

Answer:

the answer is figure C

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
For what values of x is the expression below defined?<br> √x+4÷√1-x
wariber [46]

Answer:

x=1

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
If the area of a right triangle is 9/16 sq.ft. and the height is 3/4 ft., write an equation that relates the area to the base, b
spayn [35]
B=1/2

9/16=1/2b(3/4)

Divide both sides by 3/4

1/4=1\2b

Multiply both sides by 2
7 0
3 years ago
Read 2 more answers
Other questions:
  • Find the slope of the line that contains the points (-7, -5) and (-10, 4).
    13·2 answers
  • After a researcher adds 5 points to every score in a sample, the standard deviation is found to be s = 10. the original sample h
    10·1 answer
  • In 1998, Cathy's age is equal to the sum of the four digits in the year of her birthday, then how old was Cathy in 1998?
    8·1 answer
  • How to do you do this
    8·2 answers
  • Use the Distributive Property to simplify the expression.<br><br> 12(6−k) = ???
    13·1 answer
  • Is the sequence 7, 9, 12, 16 geometric
    13·1 answer
  • The time it takes to process phone orders in a small florist/gift shop is normally distributed with a mean of 6 minutes and a st
    13·1 answer
  • (ii) n is an integer and 6n +5 &lt;20
    12·1 answer
  • Real answers only pls! no links either!
    11·1 answer
  • If 5 20 times 2 Superscript 2 minus 3 x Baseline = 10 times 2 Superscript negative 2 x Baseline 5, what is the value of x? â€"3
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!