The records of a computer retail store show that out of the 50 customers who purchased a desktop computer last month, all but 12 also purchased a service plan that extends the warranty for an extra year. Out of the 20 customers who purchased a notebook computer last month, all but 6 purchased the same service plan.

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step-by-step explanation:

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

investment b is an ordinary annuity with $3,909.64 in the account after one year.

step-by-step explanation: