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AlexFokin [52]
2 years ago
10

An alloy is made with 3 gram of silver, 18 gram of copper, 6 gram of aluminium and 3 gram od zinc. Find what part of the total i

s used for each metal.​
Mathematics
1 answer:
Rainbow [258]2 years ago
5 0
Add each metal together:
3+18+6+3 = 30

Now put divide each metal by 30 and multiply by 100 to get what percentage is each metal is of the alloy:

Silver- 3/30 x 100 = 10%
Copper- 18/30 x 100 = 60%
Aluminium- 6/30 x 100 = 20%
Zinc- 3/30 x 100 = 10%

(Ensure they all total 100% - which they do)
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2 1/4

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Subtract

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3 years ago
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Jon is launching rockets in an open field. The path of the rocket can be modeled by the quadratic function h(t) = -16t^2 + 96t,
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It will reach 80 feet for the second time after 5 seconds.

We set the equation equal to 80 feet:
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When solving quadratics, we want it equal to 0, so we subtract 80 from both sides:
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We use the quadratic formula to solve:
t=\frac{-96\pm \sqrt{96^2-4(-16)(-80)}}{2(-16)}
\\
\\t=\frac{-96\pm \sqrt{9216-5120}}{-32}
\\
\\t=\frac{-96\pm \sqrt{4096}}{-32}
\\
\\t=\frac{-96\pm 64}{-32}
\\
\\t=\frac{-96+64}{-32} \text{ or } 0=\frac{-96-64}{-32}
\\
\\t=1 \text{ or } t=5
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Find the distance between the two points rounding to the nearest tenth (if necessary).
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Answer:

the distance between the two points =is 13

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