Answer:
160 ft^2
Step-by-step explanation:
First you have to find the width, then you find the area. To find the width with a percentage we do Part/ Total = %/100 and we cross multiply. We need to find the part so that is the unknown, we will call it 'w' for width
w/20 = 40/100 Now we cross multiply, the x and the 100 and the 20 and 40
w * 100 = 100w
20 * 40 = 800
Now we have 100w = 800 The next step is to divide both sides by 100 so we just have w
100x/100= w
800/100 = 8
w = 8
The width is 8
Now we find the area which is length x width
20 x 8 = 160
So the area is 160 ft^2
Answer:
A) 450
Step-by-step explanation:
74%=0.74
So 0.74 of 587 is 0.74 * 587
=434.38
That is the closest to 450.
<span><u><em>The correct answer is: </em></u>
C) isolating a variable in one of the equations.
<u><em>Explanation</em></u><span><u><em>: </em></u>
In order to solve a system of equations using substitution, we must have one of the variables isolated; this is the only way we have something to substitute. If one of the variables is not already isolated, that must be our first step.</span></span>
Answer:
The first number = 8
The second number = 12
Step-by-step explanation:
let the given first number = x
And the given second number = y
Now, according to the question:
x = y - 4
2 y = 5x - 16
Now substitute the value of x in (2)
2 y = 5x - 16 ⇒ 2 y = 5(y -4) - 16
or, 2y = 5 y - 20 - 16
or, - 3 y = - 36
⇒ y = 36/3 = 12
So , the second number y = 12
and x = 12 - 4 = 12 - 4 = 8
Hence, the first number = 8
and the second number y = 12
Answer:12.6 inches of hair in one month
Step-by-step explanation:
0.6x21= 12.6 inches