What is the sum of sqrt 18 plus sqrt 72

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?

The motion of a weight that hangs from a spring is represented by the equation h=8sin(2pi/3t). it models the weight’s height above or below the rest position as a function of time. approximately when will the object be 3 inches above the rest position?

Two less than the quotient of a number and four is less than six. i need the inequality. a. x< 32 b.x< -32 c.x> 16 d.x> -16