does anybody know what this is please help

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does anybody know what this is please help

I need help on this question because im struggling on it

Solve: 2x+y+z=3 2x-y-z=9 X+y-z=0

Use the Remainder Theorem to determine whether x + 13 is a factor of the polynomial 𝑓(𝑥) = 𝑥^4 + 12𝑥^3 − 9𝑥^2 + 48𝑥 − 52.

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what does "a" equal?

-2-2y=-32 5x-2y=38

I got 8.25 as my answer but instructor said that it is not 8.25 so I am confused

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a ball is dropped from a height of 160 cm .the ball loses 25% of its previous height after each bounce . the graph models the hight of the ball