Complementary angles add up to 90 degrees. Supplementary angles add up to 180 degrees, so no.
2x^2 + 10x + 8
=2( x + 1) (x + 4)
V = L³ = 64 => L = ∛64 = 4 cm
A = L² = 4² = 16 cm²
At = 16 x 6 = 96 cm²
We are given
edge of cube =x
we know that formula for volume of cube

we are given

we can plug value

now, we can solve for x
![\sqrt[3]{x^3} =\sqrt[3]{\frac{1}{8} cm^3 }](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7Bx%5E3%7D%20%3D%5Csqrt%5B3%5D%7B%5Cfrac%7B1%7D%7B8%7D%20cm%5E3%20%7D)
............Answer
Find 20% first
20% of 84 is 16.8
tax is 7% of 84 which is 5.88
total
84+16.8+5.88=$106.68