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In-s [12.5K]
2 years ago
15

You need a 35% alcohol solution. On hand, you have a 715 mL of a 20% alcohol mixture. You also have 90% alcohol mixture. How muc

h of the 90% mixture will you need to add to obtain the desired solution?
Mathematics
2 answers:
anyanavicka [17]2 years ago
8 0
You will need 90% to obtain the desired 75%
asambeis [7]2 years ago
6 0

Answer:

90% Solution

Step-by-step explanation:

5% of 90 + 90% of x = 75% of (90 + x)

5×90/100 + 90x/100 = 75×90/100 + 75x/100

Or 90x/100 - 75x/100 = 75×90/100 - 5×90/100

Or 15x/100 = 90×70/100

Or X = 420ml

You Will Need ML Of The 90% Solution To Obtain ML Of The Desired 75% Solution.

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If I flip a coin 200 times and it lands heads of every time what is the probability that it will land a heads up on the next fli
jeyben [28]

Answer: The answer is still 50/50

Step-by-step explanation:

because there is 2 sides of a coin ( heads, and tails ) no matter how many times you flip it, the chances will forever stay at 50/50

4 0
2 years ago
Read 2 more answers
I need help with this question please I’ll give u brain
lina2011 [118]

Answer:2In2-2In3

Step-by-step explanation:

In(4/9)

In4-In9

In2^2-In3^2

2In2-2In3

7 0
3 years ago
Can you guys please help me? I understand everything but the last step.​
MariettaO [177]

Answer:

It is because you have to get rid of the power of 2 from c. In order to get rid, you have to square root it on both sides :

c² = 74

√(c²) = √74

c^(1/2×2) = √74

c = √74

Using Indices formula, (a^m)^n = a^(mn)

8 0
3 years ago
Factor completely. -5 x2y + 10 xy - 15 xy2<br><br> I need help.
ASHA 777 [7]

Answer:

5\,x\,y\,(-x+2-3y)

Step-by-step explanation:

Always proceed by first extracting all common factors to all terms:

Notice that the factors: 5, x, and y are present in all terms, so we can extract them from the trinomial:

-5x^2y+10xy-15xy^2\\5\,x\,y\,(-x+2-3y)

Now, the trinomial left (-x+2-3y) cannot be factored out, so then factoring is complete.

4 0
3 years ago
Mitch Watt is single, claims 4 allowances, and earns $587.94 gross pay each week. If each allowance is $63.46, how much is his t
ss7ja [257]
Taxable income= Gross pay + allowances
Taxable income= 587.94+(4*63.46)
=587.64+253.84
=841.48

3 0
2 years ago
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