Plz , will give brainliest.

find the variable if the value of 7m−3 is half as big as the value of 12m+1.

Which expression is equivalent to the expression shown?

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?

Find the measure of angle a in the following triangle