A bookcase has two shelves. The top shelf has 10 more than 1/3 the number of books on the bottom shelf. There are 12 books on the bottom shelf. How many books are on the top shelf? a.4
b.14
c.40
d.46
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Cohen chose D as the correct answer. How did he get that answer. Pls show how you got it pls!!!​

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers.a) one of the 400 passengers is selected uniformly at random.let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42