There is a sales tax of on an item that costs $6 before tax. A second item costs before tax. What is the sales tax on the second item?

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

Which is the completely factored from of xy^3-x^3y

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