Me with all 3 parts! :

sam's employer deducts 20% in payroll and state taxes from his base salary before writing his paycheck. sam's monthly pay check is 1,600.
part a: what is sam's salary before the deductions for payroll and state taxes?
part b: sam puts 1/5 of his pay check into a saving account each month. how much does he save each month?
part c: next month sam's employer is changing it's pay scale, and sam's base salary will change by -8%. his employer with still deduct 20% for taxes. what will be his salary before deduction and how much will his paycheck be next month?
show your work.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

In one day there are too high tides into low tides and equally spaced intervals the high tide is observed to be 6 feet above the average sea level after six hours passed a low tide occurs at 6 feet below the average sea level in this task you will model this occurrence using a trigonometric function by using x as a measurement of time assume the first high tide occurs at x=0. a. what are the independent and dependent variables? b. determine these key features of the function that models the tide: 1.amplitude 2.period 3.frequency 4.midline 5.vertical shift 6.phase shift c. create a trigonometric function that models the ocean tide for a period of 12 hours. d.what is the height of the tide after 93 hours?

I’m confused on how to work the pie charts