Answer:
what the choices?
Step-by-step explanation:
Well a perfect square looks like this:
6 x 6
2 x 2
So the number 72 is between the PRODUCT of two perfect squares such as those.
One product has to be above 72, and the other below it.
So lets multiply.
8 x 8 = 64
9 x 9 = 81
Oh look at that, 72 is between 64 and 81.
It would take 16 days
explanation
if it takes 15 for 4 people to work 8 hours to complete the task, it would be a total of 480 hours. I multiplied 15x4x8. i multiplied 5x6 to get 30. I have to find the third value so i divided 30 from 480 to get 16.
Answer:
Step-by-step explanation:
For the surface area we need to add up all the areas in the pyramid:
- area of the triangle sides (there are 4 triangles)
Area of the base:
the base is a square, and the area of a square is given by:
where 
is the length of the side: 
, thus:
Area of the triangles:
one triangle has the area given by the formula:
where 
is the base of the triangle: 
and 
is the height of the triangle: 
, thus we have the following:
the expression that represents the surface area of the pyramid is:
substituting our values:
which is option B
Sub in 6 for x in the equation and you have:
4(6) + y = 20
24 + y = 20
y = -4
