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Hi there!
Recall the volume of a pyramid is:
V = 1/3(bh)
We are given the volume and side length of the base. Find the area of the base:
A = s²
A = (5xy²)² = 25x²y⁴
Plug in the solved for base:
125x³y³ = 1/3(25x²y⁴)h
To isolate for h, begin by multiplying both sides by 3:
375x³y³ = (25x²y⁴)h
Divide both sides by 25x²y⁴. Use the following exponent property:
xᵃ / xᵇ = xᵃ⁻ᵇ
Thus:
375x³y³ / 25x²4⁴ = 15x/y.
The height must be equal to:
(1)
given =
( cross- multiply )
10j = 54 ( divide both sides by 10 )
j = =
← in simplest form
(9)
let h be the hours worked daily , then
3h = 20 =
( divide both sides by 3 )
h = ÷ 3
= ×
=
= 6
She worked 6 hours each day