what is the answer to this At a sale, shirts were sold for $15 each. This price was 80% of their original price. What was the original price?

Use the x-intercept method to find all real solutions of the equation. -9x^3-7x^2-96x+36=3x^3+x^2-3x+8

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?