Are 4vw, 3w2v, and 2wvw like terms? ?

Pls if a cow has a mass of 9×10^2 kilograms, and a blue whale has a mass of 1.8×10^5 kilograms, which of these statements is true?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase