Which situation has a unit rate of $7?
a. trevor spent $49 on 2 theater tickets
b. sally bought a pack of 5 t-shirts for $35
c. brandon bought 7 gallons of gas for $14
d. gina bought nail polish for $5 and a pack of gum for $2
you.

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.