<h3>
Answer:</h3>
- 32 kg of 30% copper
- 48 kg of 55% copper
<h3>
Step-by-step explanation:</h3>
Let x represent the mass of 55% copper alloy that is to be used in the mix. Then 80-x is the mass of 30% copper alloy to be used. The total amount of copper in the mix is then ...
... 0.55x + 0.30(80-x) = 0.45·80
... 0.25x = 12 . . . . . . simplify, subtract 24
... x = 48 . . . . . . . . . divide by the coefficient of x
... 80-x = 32 . . . . . . the mass of 30% copper alloy required
The metalworker should combine 32 kg of 30% copper alloy with 48 kg of 55% copper alloy to make 80 kg of 45% copper alloy.
Answer:
x^2 - 2x - 1.
Step-by-step explanation:
(g - f)(x)
= g(x) - f(x)
= x^2 - 2 - (2x - 1) (Note we put the 2x -1 in parentheses).
= x^2 - 2 - 2x + 1
= x^2 - 2x - 1.
<em>Answer:</em>
<em>2.133</em>
<em>Step-by-step explanation:</em>
<em>Hope this helps!</em>
Answer:
1:3
Step-by-step explanation:
15/15 = 1 and 45/15 = 3
