Homework Help: Algebra/Math

Posted by Anon on Wednesday, February 27, 2013 at 8:48pm.

Can you show work por favor? :)
A metalworker has a metal alloy that is 20% copper and another alloy that is 60% copper. How many kilograms of each alloy should be combined to create 80 kg of a 53% copper alloy?

Algebra/Math - Sarah, Wednesday, February 27, 2013 at 9:39pm
Ok, so you have x as the kg.

The equation should look like this:

.20(x) + .60(80-x) = .53(80)

Then you can multiply everything out to solve for x.
Algebra/Math - Karen, Wednesday, February 27, 2013 at 11:56pm
What is the factor (x to the third power + 4x to the second power)(2x+8)?

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