Please help me with this

Step-by-step explanation:

a. area of shaded region= area of rectangle -area of triangle

area= (17*14)-(1/2*8.7*9.5.sin72)

= 159.4m²

b.20l cover 20m²

so 159.4l would cover 159.4m²

20m²-->(cost)$ 21.99

159.4-->?

(21.99*169.4)÷20

=$175.3

m∠a is 90°

m∠b is 40°

6^2 or 36

step-by-step explanation:

6000n

6×1000n

6×10^3 n

so we need 6n need to be a perfect cube

so n has to be 6^2 so that 6n is 6^3

what i'm saying is if you let n be 6^2 you have 6^3×10^3 or 60^3 which is a perfect cube