Answer:
In 7 years
Step-by-step explanation:
Let
n ----> the number of years
x -----> Kate's age
y ----> Victor's age
we know that
we have
Victor's age is 5
substitute the given values
Solve for n
<u><em>Verify</em></u>
In 7 years
Kate's age is 17+7=24
Victor's age is 5+7=12
24=2(12)
so
Kate is twice as old as Victor
Given that amount of first acid solution = 4 liters
Let concentration of the first acid solution = x
then effective amount of first solution = 4x
Given that amount of second acid solution = 10 liters
Givn that concentration of the second acid solution = 40% = 0.4
then effective amount of second solution = 0.4(10)
Then amount of resulting acid solution = (4+10) liters
Givn that concentration of the resulting acid solution = 30% = 0.3
then effective amount of resulting solution = 0.3(4+10)
Combining all those results gives equation
4x +0.4(10) = 0.3(4+10)
4x +4 = 0.3(14)
4x +4 = 4.2
4x = 0.2
x=0.05
Hence final answer is 0.05 or you can say 5%.
120 g from different country
2(3 + 9x) - 2x
= 6 + 9x - 2x <----------------mistake right here
= 6 + 7x
Correct:
Expanding by using distributive property
2(3 + 9x) - 2x
= 2* 3 + 2 * 9x - 2x
= 6 + 18x - 2x
= 6 + 16x
Answer:
I believe it is 47 degrees
Step-by-step explanation:
Triangles add up to 180 degrees
54 + 79 = 133
180 - 133 = 47
