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Komok [63]
3 years ago
6

A pharmacist has 80 milileters of a 25 percent saline solution. Which expression can be used to find the percentage of the conce

ntration
Mathematics
1 answer:
Thepotemich [5.8K]3 years ago
6 0

Answer:


Step-by-step explanation:

Final concentration % = [grams of salt / mililiters of solution] * 100


grams of salt = grams of salt from solution 1 + grams of salt from solution 2


grams of salt from solution 1 = mililiters * %/100 = 80 mililiters * 0.25 g/mililiters = 20 g


grams of salt from solution 2 = mililiters *%/100 = x*0.10 g/mililiters = 0.1x


mililiters of final solution = mililiters from solution 1 + mililiters from solution 2


mililiters of final solution = 80 mililiters + x mililiters


=> Final concentration, %  =  [0,10x + 20 g] / [x + 80 mililiters] * 100


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divide top and bottom by 2

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7 0
3 years ago
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Substitution doesn't work for this, but elimination does.

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divide by 28 on both sides.

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Burger King sells burgers for $3.50 per burger. On Fridays, you can buy 2 burgers and get 1 free. They sold 500 burgers in 1 wee
faust18 [17]

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The maximum profit would assume Burger King does not sell any burgers on Friday, therefore all 500 burgers were sold at $3.50. 500*$3.50 = $1750 in maximum earnings for the week. More information is needed about the split between the burgers sold over the week.

Maybe the question was trying to say 500 burgers were sold on Friday. In that case, assuming every customer got three burgers, 500/3 = 166.6 customers, rounding down because you cannot have half a customer, 166 customers on Friday. Each customer paid for two burgers 166*2*$3.50 = $1162 in earnings on Friday.

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If this is correct the answer would be
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3 years ago
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Answer:

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Step 1: Subtract x from both sides.

2x2+9x−1−x=x−x

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Step 2: Use quadratic formula with a=2, b=8, c=-1.

x=

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Step-by-step explanation:

This is what I got but I'm not 100% positive. I checked it on a calculator and it seemed to check out.

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