Determine which code is invalid and why?
a. 7-80133-52451-7
b. 7-44120-87006-7
c. 8-42356-05511-8

What value of x is in the solution set of –5x – 15 > 10 + 20x?

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

George is putting trim around his rectangular deck, including the gate. he will need 44 feet of trim to do the entire deck. if the deck is 13 feet long, how wide is the deck?