Answer:
Amount the watch normally costs: w
Amount if the discount: 0.3w
Percent decrease of the discount, as a decimal: 0.3
Percent of the normal cost that Chad paid, as a decimal: 0.7
Answer:
a. x = 14
b. Perimeter = 77
Step-by-step explanation:
a. Based on the Triangle Proportionality Theorem:
![\frac{2x - 2}{13} = \frac{21 - 7}{7}](https://tex.z-dn.net/?f=%20%5Cfrac%7B2x%20-%202%7D%7B13%7D%20%3D%20%5Cfrac%7B21%20-%207%7D%7B7%7D%20)
![\frac{2x - 2}{13} = \frac{14}{7}](https://tex.z-dn.net/?f=%20%5Cfrac%7B2x%20-%202%7D%7B13%7D%20%3D%20%5Cfrac%7B14%7D%7B7%7D%20)
![\frac{2x - 2}{13} = 2](https://tex.z-dn.net/?f=%20%5Cfrac%7B2x%20-%202%7D%7B13%7D%20%3D%202%20)
Cross multiply
![2x - 2 = 2(13)](https://tex.z-dn.net/?f=%202x%20-%202%20%3D%202%2813%29%20)
![2x - 2 = 26](https://tex.z-dn.net/?f=%202x%20-%202%20%3D%2026%20)
Add 2 to both sides
![2x = 26 + 2](https://tex.z-dn.net/?f=%202x%20%3D%2026%20%2B%202%20)
![2x = 28](https://tex.z-dn.net/?f=%202x%20%3D%2028%20)
Divide both sides by 2
x = 14
b. Perimeter of ∆QRS = RQ + QS + RS = (2x - 2) + 13 + 17 + (21 - 7) + 7
Plug in the value of x
= (2(14) - 2) + 13 + 17 + 14 + 7
= 26 + 13 + 17 + 14 + 7
= 77
the answer is in the picture
12.8/8 is 1.6
What you have to do is do a division house and then just keep dividing