General Maths Puzzle General Ability

The demand equation for a quantity q of a product at price p in dollars is p=90 - 3q^2.Find the revenue equation R(q) and use it to answer the question below.
What production level will maximize revenue ?

a)23 units b) 35 units c)15 units d) 50 units

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General Other Question

Q1. In how many ways can you draw a first card and then a second card from a deck of 52 cards?

Q2. In how many ways can you draw two cards from a deck of 52 cards.

Are the answers for Q1 and Q2 the same? Give reasons how many days will it take 45 rats to eat 25 blocks of cheese if they all eat equal parts and they decrease by 3 every day in number