Pls help (mathematics)

Nick and nora are married and have three children in college. they have an adjusted gross income of 47,400. if their standard deduction is 12,600 itemized deductions are 14,200 and they get an exemption of 4000 for each adult and each dependent what is their taxable income

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Find the slope of the line passing through a pair of points