David U.

Word Problems

07/28/15

Merchant has $20/lb coffee and wants to mix 40 lbs of $80/coffee to get a mixture worth $40. How many lbs of the $20 coffee should he use?

Word problem

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Word Problems

07/27/15

A merchant has coffee for $20/lb and mixes it with 40lbs of $80/lb coffee.the mixture is $40/lb. how many lbs of the $20/lb coffee should be used?

Word problems

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Word Problems

07/27/15

Ann and Nancy use metal alloy at 19%. How many ounces at 16% alloy must be mixed with 20% to form 88ozof alloy?

Word problems

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Math

05/07/15

how many dimes did Rosalyn collect?

Rosealyn's company, Snack Attack Inc., owns a few vending machines. Last night she collected $82.50 in dimes and quarters. If Rosalyn collected 50 quarters than dimes, how many dimes did she collect?

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Equations

08/05/13

Find the inverse Laplace transform?

Find the inverse Laplace transform of F(s)=(2s+2)/(s^2+2s+5). Answer: f(t)=2e^-t*cos 2t

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Calculus Integrals

07/27/13

Definite Integral best method to double check answers?

A problem I am dealing with is finding the Definite Integral, from 1 to 2, of (4x^3 – 3x^2) dx: I understand that you integrate, Plug in upper limit then subtract lower limit. my answer comes out... more

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