A triangle has sides of length 10,8, and y inches which of an expression for the perimeter of the triangle, and what is the perimeter when y=7

Give me the equations of two lines that have the same slope but are not parallel.

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?

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?