exam Maths Puzzle Numerical Ability

e. Find the Profit Equation by substituting your equations for R and C in the equation . Simplify the equation.

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exam Other Question

Samantha has a total of one hundred forty-one pennies,nickels and quarters.She has a total of $15.17. She has fifteen more quarters than pennies and fifteen fewer quarters than nickels. How many of each coin does she have? can you help me multiply using the vertical method?
(2r-3s)(4r^2+6rs+9s^2)