4 pairs of shoes cost $80. What is the cost of 7 pairs of shoes??? someone help

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

What is the binomial expansion of (2x-3)^5

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)