I cant solve, please show the work!

The following data represent the number of certain computer system sold per day at a local computer shop and their prices (in hundreds of dollars).

Price(x)34363235303840

UnitsSold (y)3465921

Use a computer to answer the following questions (round to two decimal places):

I. The simple regression equation is.The letter associated with the correct answer is

a) Y=19.5 -0.44X

b) Y=29.79 -0.73X

c) Y=32.21 -0.79X

d)Y=37.46 -0.94X

e)None of the above

II. Estimate the number of units sold if the price is 3,500 dollars.The letter associated with the correct answer is

a) 3.77

b) 4.24

c) 5.42

d) 6.43

e) None of the above

III. Find error # 5.The letter associated with the correct answer is

a) -0.05

b) 0.58

c) 1.11

d) 1.44

e)None of the above