Line z has a slope of 2.5 and goes through point (4, 13). Which equation best represents line z? Answer in the form y=mx+b please

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.

Adoughnut shop charges $0.50 for each doughnut and $1 for a carryout box. shirley has $10 to spend. which inequality can be used to find d, the number of doughnuts she could have bought if she also wants them in one carryout box?