Factorize 2^x+7 + 2^x+6

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?

What is the mean of the data set 125, 141, 213, 155, 281