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omoaye
24.07.2019 •
Mathematics
Brass is an alloy formed using copper and zinc in the ratio 3: 2 based on weight. if 120g of copper are needed for a certain piece of brass, how much zinc is needed?
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Ответ:
We can solve by 2 ways ( The 2nd way might be easier )
→ To make 1 brass alloy, the ratio of copper to zinc is 3 : 2
Brass = copper + zinc
= 3 : 2
3x : 2x
Copper needed is 120g
↓
3x = 120g
Divide by 3 to isolate x
x = 40
Ratio of Zinc is 2
substitute 40 in place of x
2x = 2 ( 40 ) = 80g
Or
→ 3 : 2
120 : p
Cross multiply
3p = 120 x 2
3p = 240
p = 80g
80g of Zinc will be needed with 120g of Copper
Ответ:
Step-by-step explanation:
The given parabola has focus at:
and directrix at
This is a vertical parabola that opens downwards.
The equation is of the form;
p is the distance from the vertex to the directrix.
Since the vertex is at the origin, we have
We plug this value into the equation to get:
We solve for y to obtain:
The 3rd option is correct.