To find an average you take the numbers to be averaged and add them together then You take the number and divide it by the number of numbers, in this case 4, and that gives you the average.
on this problem you want to do the opposite. you know the average she wants, an 87, so you multiply it by 4. 87*4=348. then you add the three numbers you have (88,81 and 87) and you get 256.
then you subtract 256 from 348 and you get 92. 92 is your answer to check just add 87+81+88+92=348
348/4=87
87 was the average she wanted.
Hope this helped! good luck :)
Answer:

Step-by-step explanation:
Given
--- base of the tank base
--- height of the tank base
--- height of the tank
Required:
Determine the volume of water needed for 6 inches below the top
First, calculate the area of the tank base.




If the tank is filled 6 inches below the top, this means that the height of the water is H - 6.
So, the volume is:

Substitute 240 for Area and 36 for H



Answer:
8x^6y^12
Step-by-step explanation:
Hope that's right!!
Answer:- 1. True. A compass is used to make circles and arcs in geometric constructions.
2. False. A classical geometric construction requires a straightedge , compass and pencil etc to draw a geometrical shape.
3. True. Geometric constructions are created with a compass and straightedge.
4. True. Protractors are used in geometric constructions to measure degree measures. Rulers are used in geometric constructions to measure segment lengths.
The correct answer is (C) centilters