There are 50 stack.
10 in each stack.
10 multiplied by 50
10×50=500
Xy=49
x-y=13
x=13+y
y(13+y)=49
y²+13y-49=0
solve using the quadratic formula
Answer:
- x = -1/2(1 +√21) ≈ -2.79129
- x = -1/2(1 -√21) ≈ 1.79129
Step-by-step explanation:
We assume the middle term is supposed to be 4x.
We can remove a common factor of 4 to simplify this a bit.
x^2 +x -5 = 0
This is of the form
ax^2 +bx +c = 0
where a=1, b=1, c=-5.
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The <em>quadratic formula</em> gives the solutions as ...
![x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}](https://tex.z-dn.net/?f=x%3D%5Cdfrac%7B-b%5Cpm%5Csqrt%7Bb%5E2-4ac%7D%7D%7B2a%7D)
Filling in the given coefficients, we have ...
x = (-1 ±√(1^2 -4·1·(-5)))/(2·1)
x = (-1±√21)/2
The solutions are x = -1/2(1 +√21) and -1/2(1 -√21).
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<em>If what you wrote is what you intend</em>, then the equation simplifies to 4x^2 -16 = 0.
Dividing by 4 and factoring the difference of squares gives ...
x^2 -4 = 0
(x -2)(x +2) = 0
These factors are zero (hence their product is 0) for the values x = 2 and x = -2.
The solutions are x=2 and x=-2.
"Square inches" means area, so 60" wide and 3 feet long is multiplied, however, they have to be in the same unit. So, 3 feet = 36 inches since 1 foot is 12 inches and 3(12) = 36.
Therefore, 60 inches * 36 inches = 2,160 square inches of fabric.
100 = 30 + 10 + 10x
100 = 40 + 10x
-40 -40
60 = 10x
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10 10
6 = x
The equation is: 100 = 30 + 10 + 10x
The price of one cap is: $6