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kolbaska11 [484]
3 years ago
6

Jason has 4 gallons of hand sanitizer that contains 25% alcohol. He wants to make a hand sanitizer that contains 50% alcohol. Ho

w many gallons of pure alcohol should he add?
Mathematics
1 answer:
alexandr402 [8]3 years ago
8 0

Answer:

2 gallons of pure alcohol

Step-by-step explanation:

Let x represent the number of gallons of pure alcohol needed, and create an equation:

4(0.25) + x(1) = (x + 4)0.5

1 + x = 0.5x + 2

x = 0.5x + 1

0.5x = 1

x = 2

So, 2 gallons of pure alcohol should be added.

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3 years ago
Henry is looking for the best deal on a tablet that regularly costs $829. Help him compare the price of the tablet at a stre
Maslowich

Answer:

$165.8 ;

$223.83 ;

Henry would pay less for the tablet on the website.

Step-by-step explanation:

Given :

Regular price = $829

On website :

80% discount off the regular price :

(100 - 80)% * regular price

20% * 829

0.2 * $829 = $165.8

At store :

70% off regular price :

(100 - 70)% * 829

0.3 * 829

= $248.7

10% off sale price :

(100 - 10)% * $248.7

0.9 * 248.7

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Henry would pay less for the tablet on the website.

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2 years ago
To win a​ lottery, 7 numbers are drawn at random from a pool of 21 numbers. Numbers cannot repeat. If a person has one​ ticket,
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Answer:

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7 0
2 years ago
Read 2 more answers
Solve the equation: Sin2x - Sinx = 0
Viktor [21]
We know that sin2x=2sinxcosx 
(search the net for proof if you wish) 

So the original equation becomes

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sinx(2cosx-1)=0 
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sinx=0 than x=2kπ
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A shoreline is eroding at a rate of 1/3 foot per 3 months . How many feet are eroding per year?
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