A phone company charges $10.50 for 3 hours of service. What is the cost per hour? A. $31.50
B. $13.50
C. $7.50
D. $3.50

D. $3.50

Step-by-step explanation:

The phone company charges a total of $10.50 for 3 hours so for one hour you would have to divide 10.50 by 3 to get the answer for ONE hour.

i would say true? if the unit was informational and it "refreshed your understanding", then true.

proportions are fractions that equal to each other. so if two fractions are the same, they are proportional.

let's check the answers to see if they are proportional.

question a is not proportional because you can't turn 1.5/3 to 3/9. if you try to multiply 1.5/3 by 2 or 3, you wont get 3/9. it's impossible to make the fractions the same.

question b is not proportional because you can't turn 22/33 to 4/6. 33 can't go into 6.

question c is proportional because when you multiply 2 and 3 by 71, you would get 142/213, and those fractions equal to each other

question d is proportional because when you divide 14 and 7 by 2, you would end up with 7/3.5, and those fractions equal to each other.