What is a sequence of numbers in which the difference between any two consecutive numbers is a constant called?

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total

Anyone know these questions? i need ,.

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?