I need help for this please

Ifurniture stores having a weekend sale and is offering 20% discount on patio chairs and table the sales tax on furniture is 6.25 using function composition how can you represent the total amount a that you would need to pay for this furniture that cost x dollars

How many lines can be drawn through points j and k? 0 1 2 3

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters