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Mila [183]
4 years ago
9

HALP, plz explain steps,

Mathematics
1 answer:
tia_tia [17]4 years ago
8 0
Let's say he's gonna use x grams of 90% gold alloy and y grams of 50% gold alloy.

The total percentage of gold in the mixture will thus be (x*0.9+y*0.5)/8=0.75 (=75%)

What is more x+y=8

The system is thus x+y=8, 0.9x+0.5y=8*0.75=6
From the first one we get y=8-x, which we insert in the second one : x(0.9-0.5)+0.5*8=4 hence x=(6-0.5*8)/(0.4)=5 and y=8-5=3

The answer is 5 grams of 90% gold and 3 grams of 50% gold
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Answer:

Step-by-step explanation:

6z² + 12z +1 8​

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That's it.

8 0
3 years ago
PLEASE HELP ASAP! 30 points!
rusak2 [61]
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3 0
3 years ago
For a school fundraiser students are selling snack bags and candy bars to raise money on Wednesday the students or 23 snack bags
meriva

Answer:

$1.75

Step-by-step explanation:

The selling for each candy bar may be determined by  a set of linear equations. This pair of linear equations may be solved simultaneously by using the elimination method. This will involve ensuring that the coefficient of one of the unknown variables is the same in both equations.

It may be solved by substitution in that one of the variable is made the subject of the equation and the result is substituted into the second equation .

Let the cost of a snack bag be s and that of a candy bar be c, then if on Wednesday the students or 23 snack bags and 36 candy bars that raised $114.75 on Thursday the seventh so 37 snack bags and 36 candy bars that raised $146.25

23s + 36c = 114.75

37s + 36c = 146.25

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s = $2.25

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3 years ago
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The answer is 11. Hope this helped.
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