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Alexxx [7]
3 years ago
11

A metallurgist has one alloy containing 46% copper and another containing 69% copper. How many pounds of each alloy must he use

to make 43 pounds of a third alloy containing 60% copper?
Mathematics
1 answer:
Marizza181 [45]3 years ago
4 0
Suppose x pounds of 0.46 copper and y pounds of 0.69 copper are used to make 43 pounds of 0.6 copper, thus
x+y=43
⇒x=43-y......i
Also:
0.46x+0.69y=0.6×43
0.46x+0.69y=25.8.....ii
substituting i in ii we get:
0.46(43-y)+0.69y=25.8
19.78-0.46y+0.69y=25.8
putting like terms together we obtain:
0.23y=6.02
y=26.174
hence:
x=16.826

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when graphed on a coordinate plane, Bumby avenue can be represented by the equation y=-4x-7. Primrose Avenue can be represented
Lilit [14]

The complete question is;

when graphed on a coordinate plane, Bumby avenue can be represented by the equation y = -4x - 7. Primrose Avenue can be represented by the equation 8x + 2y = 17. Are these two parallel?

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D) They are not parallel because their slopes are opposite reciprocals

Answer:

Option D: They are not parallel because their slopes are opposite reciprocals

Step-by-step explanation:

Bumby avenue is represented by the equation y = -4x - 7 while Primrose Avenue can be represented by the equation 8x + 2y = 17.

Now, the general formula for slope intercept is;. y = mx + c.

Where m is the slope and c is the y - intercept.

This means the slope of bamby is - 4 while that of Primrose is 8.

The slopes are not the same and so options A and B are not correct.

Now, -4 is an opposite reciprocal of 8/-2.

But an opposite reciprocal means that both lines on the graph are perpendicular to each other.

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7 0
3 years ago
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Answer:

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Step-by-step explanation:

GIVEN DATA:

Total sum of consecutive number is 1800

sum of n number is given as

sum = \frac{ n(n+1)}{2}

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from the data given we have1800 = \frac{n(n+1)}{2}

solving for n we get

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therefore n = 60

4 0
3 years ago
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