Tomas rides his bike at a steady rate of 4 miles every 20 minutes. graph the situation. find the unit rate of
this proportional relationship. express the unit rate as a simplified fraction, if necessary.
tomas's ride
distance (mi)

What is the perimeter of square abcd? units units 28 units 37 units

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.

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?