Will is at a shirt sale where he can buy one and get a second one for 40 percent off. he wants to buy two shirts priced at $29 each. how much will he pay? cost after discount = (2 × list price) – (list price × discount percentage)

The sum of the product of 4 and x and the product of 7 and y is 61. the sum of the product of 12 and x and the product of 21 and y is 61. what are the values of x and y?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Don't know how to find x given these segment lengths