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Algebra-please check my work

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check my answers please.

Use the Intermediate Value Theorem to determine whether the polynomial function has a real zero between the given integers.

f(x) = 2x3 + 10x2 - 8x - 5; between 1 and 2
-I got: f(1)=1 and f(2)=35;no

Determine the maximum possible number of turning points for the graph of the function.

f(x) = 8x^3 - 3x^2 + -8x - 22
-i got 2

f(x) = x^7 + 3x^8
i got 7

g(x) = - -1/x + 2
i got 0

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