After a 15% off sale, some jeans were $11.50,how much were the jeans before the sale

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4