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Doss [256]
2 years ago
9

Can someone show me how to do this? What volumes of 60% hydrochloric acid solution and 30% hydrochloric acid solution must be mi

xed to make 125mL of 36% hydrochloric acid solution?
Mathematics
1 answer:
sleet_krkn [62]2 years ago
6 0

<span>
u need two equations.</span><span>x + y = 125
0.60x + 0.30y = (0.36)(125)</span>

<span /><span>x + y = 125
0.60x + 0.30y = 45</span>

<span>solve for a variable in the first equation
y = 125 - x</span>

<span>plug into the second equation
0.60x + 0.30(125 - x) = 45
0.60x + 37.5 - 0.30x= 45
0.30x + 37.5 = 45
0.30x = 7.5
x = 25</span>

<span>plug the answer for x into the first equation
25 + y = 125
y = 100</span>

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I don't know how to do this problem:
mariarad [96]

Answer:

3^3×3

81

3^7/3^3

Explanation:

First you should solve the expression you've got there.

(3^6×3^-4)^2

3^6= 3×3×3×3×3×3 the answer is 729

3^-4 A negative exponent means repeated division by the base. So for example 2^-4=1/(2^4)

=1/(2×2×2×2)= 1/16

3^-4= 1/(3^4)

=1/(3×3×3×3)

= 1/81 If you look up the answer in your calculator the answer that will show up will be 0.01234567901

So!

(729×0.01234567901)^2= 9^2

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Now you can look at the following expressions and whichever gives the answer 81 will be correct.

hope it helps!

8 0
3 years ago
Solve 5 2/15 a =3 2/25
vovikov84 [41]

Answer:

a= 3/5

decimal form: 0.6

Step-by-step explanation:

4 0
2 years ago
Graph the function f(x)= 2x -4
galben [10]
The y intercept and -4 and going down 2 and 1 right u til you reach the end of the graph
7 0
1 year ago
Carlo’s Bakery is having a special where he packages 6 muffins together for a low price and he packages 20 cookies together for
DaniilM [7]

Answer:

They sold 60 muffins and 60 cookies yesterday

It is a LCM problem

Step-by-step explanation:

6 muffins together

20 cookies together

To sell the same amount of muffins and cookies,

Find the lowest common multiple of 6 muffins and 20 cookies

6 muffins = 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78

20 cookies = 40, 60, 80

The lowest common multiple of 6 muffins and 20 cookies is 60

Therefore,

They sold 60 muffins and 60 cookies yesterday

It is a LCM problem

6 0
3 years ago
Sara is 6 years older than max in 3 years she’ll be 1 1/2 of max’s age . how old is max ?
Andrews [41]
S = m+6
(s + 3) = (m + 3)1.5
When solved m=9 and s=15
When plugged in it works.
So max is 9 years old
4 0
3 years ago
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