Which situation represents a proportional relationship?

A car used 3 gallons of gas to drive 72 miles on a
highway and used 4 gallons of gas to drive 72 miles
in town.

A store charged $20 for 2 shirts and charged $25 for
3 shirts.

An alarm on a clock beeped 7 times in 6 seconds
and beeped 14 times in 12 seconds.

A signal light flashed yellow 7 times in 28 seconds
and flashed red 5 times in 35 seconds.

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b? define a variable for the situation. write an inequality that represents the situation. solve the inequality to find out how many months he needs to keep the website for site a to be less expensive than site b. using words, describe how many months he needs to keep the website for site a to be less expensive than site b.

Which of the following are accepted without proof in a logical system? check all that apply.