Awasher and a dryer cost $807 combined. the washer costs $93 less then the dryer. what is the cost of the dryer

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?

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.