When might it be helpful to have these two formulas (perimeter and temperature) solved for the given variable rather than its original form?

Kinu wants to buy topsoil for a section of her garden that has the dimensions shown in the figure. each bag covers 2 square yards. how many bags of topsoil should kinu buy? explain how you found the answer.

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Math question.. plz me .. best answer all