Sadie is saving for a new car. Below is the total amount of money in her savings account on the last day of each month. Click “Show Your Work” and show all steps to find the mean amount of money Sadie saves each month. Round your answers to the nearest cent.

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x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81

well, because the $0.25 is an added cost depending on how many minutes, the answer would be y = 30 + 0.25x.

mark has $52

hope this !