The sum of the first three terms of an arithmetic sequence is 6, fourth term is 16 and the sum of the first 4 terms is 22. Find the first term and determine the common difference.

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?