Select the three situations that model a sum of zero.
Explain your answer.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²