Mariano determined that the more he practiced piano the less mistakes he would make. he found that for each hour ne
practiced each week he could decrease his mistakes by 30%. mariano computed a best-fit equation of y=-0.3x + 17
where y is the total mistakes and x is the number of hours practiced. use mariano's equation to estimate the number of
mistakes per page made by a student who has practiced for 21 hours. round to the nearest tenth if necessary.

see attached

step-by-step explanation:

given the function as;

write the equation replacing f(x) with y

form   and fill a table containing values of y with corresponding values of x

you can take a range for   values of x as -3≤x≤3

solving for x=-3

for x=-2

repeat the same procedure to get the values of y for the remaining ,x=-1 to x=3

plot the values of y against values   of x and obtain the following graph

i don't know, but that looks pretty bad. my school passed us unless we failed in all the subjects, but idk abt ur school's rules.

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