Select whether the relationship between each pair of quantities is proportional.

1. a small pizza costs $9.00 and each additional topping costs $0.75. (yes/no)

2. a health club charges $45 per month. (yes/no)

3. a bike rental store charges $20 as a flat fee, plus $5 per hour. (yes/no)

4. a bathtub holding 40 gallons of water drains at a rate of 6 gallons per minute. (yes/no)

5. a car travels 60 miles in 1 hour, 120 miles in 2 hours, and 180 miles in 3 hours. (yes/no)

6. a student earns $12 for each hour she tutors. (yes/no)

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer