Nicholas bought three business related books. his total bill was $150. if one book cost him 50% more than the other two books combined what was the price of this more expensive book?

Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)

When a number is decreased by 9.9% the result is 40. what is the original number to the nearest tenth? super urgent