Please answer correctly

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

Mr. thompson is on a diet. he currently weighs 260 pounds. he loses 4 pounds per month. what part of the story makes the relationship not proportional?