Wade has already spent $7 of his earnings. he could represent the total amount he has left using the expression a − 7 ⁢ .

then wade spent another $2.

which expression represents the amount of money wade has now?

a. 7+2

b. a - 9

c. a + 9

d. a - 2

Volume of cylinder with a radius of 8cm and height of 25 cm

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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?