7 A metal pipe is 66 cm long. The inner diameter of a cross section is 3 cm, the outer diameter being
3.3 cm. Find its
(i) Inner curved surface area
(ii) Outer curved surface area
(iii) Total surface area

he kicked it up? is this the answer ?

step-by-step explanation:

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x