An alloy is a mixture of metals. Suppose that a certain alloy is made by mixing 300 grams of an alloy that contains 72% copper with 20 grams of pure copper. Answer the questions below. Do not do any rounding.
(a) How many grams of copper are in the resulting mixture?
(b) What percentage of the resulting mixture is copper?

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225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

i believe that the slope of the line is -5

step-by-step explanation:

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-12 -5(x + 4) = 3x

-12 - 5x - 20 = 3x

-12 - 20 - 5x = 3x

-32 - 5x = 3x

    + 5x   + 5x

-32 = 8x

8         8

- 4= x