Answer:
Step-by-step explanation:
the ansewer is 4
Tbh but you can see what it is on socratic
![4x^2+13=49](https://tex.z-dn.net/?f=4x%5E2%2B13%3D49)
To solve the value of x in the above equation, here are the steps.
1. Subtract 13 on both sides of the equation.
![\begin{gathered} 4x^2+13-13=49-13 \\ 4x^2=36 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%204x%5E2%2B13-13%3D49-13%20%5C%5C%204x%5E2%3D36%20%5Cend%7Bgathered%7D)
2. Divide both sides of the equation by 4.
![\begin{gathered} \frac{4x^2}{4}=\frac{36}{4} \\ x^2=9 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20%5Cfrac%7B4x%5E2%7D%7B4%7D%3D%5Cfrac%7B36%7D%7B4%7D%20%5C%5C%20x%5E2%3D9%20%5Cend%7Bgathered%7D)
3. Get the square root on both sides of the equation.
![\begin{gathered} \sqrt[]{x^2}=\sqrt[]{9} \\ x=\pm3 \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20%5Csqrt%5B%5D%7Bx%5E2%7D%3D%5Csqrt%5B%5D%7B9%7D%20%5C%5C%20x%3D%5Cpm3%20%5Cend%7Bgathered%7D)
The possible values of x are +3 and -3. The smaller value is -3.
<h2>a. Answer:</h2>
For this question we'll use the following method:
1. Let's subtract old value from new value
185$-160$ = -25$
The negative value implies that the price has decreased
2. Divide the result by the old value
25$/185$ = 0,1351
3. Convert this value to percentage:
0,1351 x 100 = 13,51%
Finally, by rounding to the nearest tenth:
13,5%
That means 13,5% decrease
<h2 /><h2>b. Answer:</h2>
1. Let's subtract old value from new value
77$-56$ = 21$
The positive value implies that the price has increased
2. Divide the result by the old value
21$/77$ = 0,2727
3. Convert this value to percentage:
0,2727 x 100 = 27,3%
Finally, by rounding to the nearest tenth:
27,3%
That means 27,3% increase