A person's part-time job pays $5.50 per hour. write an expression to represent the amount he earns for working n hours.

the person earns $ for working n hours.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?

Hormones perform important functions within the reproductive system. during puberty, a number of changes occur in the body. which hormone is responsible for the development of these characteristics in the female? estrogen progestin progesterone testosterone