Answer:
x = 3
Step-by-step explanation:

Simplify, divide the numerator and denominator by the same number

÷ 40


Cross products

Answer:
x=28 cm
Step-by-step explanation:
Ratio of length of bigger sides to smaller sides=20:10=2:1.


Answer:
Step-by-step explanation:
(3b)³ = 3³·b³ = 27b³