Which characteristic is correct for the function f(x)=−2x3+3x2 ?

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

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Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x