v asked in Science & MathematicsMathematics · 6 months ago

IMMEDIATE HELP! COLLEGE PRECALC QUESTIONS(multiple choice). I really really really need help, I have tried and failed...please help?

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  • 6 months ago
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    1) 60 + 65 - 100 = 25

    Answer is (b)

    2) Let z be the number of dollars the price is lowered.

    P(z) = (21 + 4z)(41 - z)

    P(z) = 861+ 143z - 4z^2

    selling price, x = 41 - z

    z = 41 - x

    P(x) = (21 + 4(41 - x))(x)

    P(x) = (21 + 164 - 4x)x

    P(x) = -4x^2 + 185x

    You could probably solve without creating z, but it helped me.

    3)

    (f(1 + h) - f(1))/h =

    (3(1 + h)^2 - 2(1 + h) - (3(1^2) - 2(1)))/h =

    (3(1 + 2h + h^2) - 2 - 2h - (3 - 2))/h =

    (3 + 6h + 3h^2 - 2 - 2h - 3 + 2)/h =

    (3h^2 + 4h)/h =

    3h + 4

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