Answer:I am pretty sure it’s D
Recall all interior angles in a triangle add up to 180°, therefore
![- \frac{5}{8} c](https://tex.z-dn.net/?f=-%20%5Cfrac%7B5%7D%7B8%7D%20c)
= 20
First, simplify
![\frac{5}{8} c](https://tex.z-dn.net/?f=%20%5Cfrac%7B5%7D%7B8%7D%20c)
to
![\frac{5c}{8}](https://tex.z-dn.net/?f=%20%5Cfrac%7B5c%7D%7B8%7D%20)
/ Your problem should look like:
![- \frac{5c}{8}](https://tex.z-dn.net/?f=-%20%5Cfrac%7B5c%7D%7B8%7D%20)
= 20
Second, multiply both sides by 8. / Your problem should look like: -5c = 160
Third, divide both sides by -5. / Your problem should look like: c =
Fourth, simplify
![\frac{160}{-5}](https://tex.z-dn.net/?f=%20%5Cfrac%7B160%7D%7B-5%7D%20)
to
![-\frac{160}{5}](https://tex.z-dn.net/?f=%20-%5Cfrac%7B160%7D%7B5%7D%20)
/ Your problem should look like: c =
Fifth, simplify
![\frac{160}{5}](https://tex.z-dn.net/?f=%20%5Cfrac%7B160%7D%7B5%7D%20)
to 32. / Your problem should look like: c = -32
Answer:
B) -32
Answer: ![171.4\%](https://tex.z-dn.net/?f=171.4%5C%25)
Step-by-step explanation:
Given
Time is extended from 28 days to 76 days
The percentage increase is given by
![\Rightarrow \dfrac{\text{New-original value}}{\text{original value}}\times 100](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cdfrac%7B%5Ctext%7BNew-original%20value%7D%7D%7B%5Ctext%7Boriginal%20value%7D%7D%5Ctimes%20100)
Putting values
![\Rightarrow \dfrac{76-28}{28}\times 100=\dfrac{48}{28}\times 100\\\\\Rightarrow 171.4\%](https://tex.z-dn.net/?f=%5CRightarrow%20%5Cdfrac%7B76-28%7D%7B28%7D%5Ctimes%20100%3D%5Cdfrac%7B48%7D%7B28%7D%5Ctimes%20100%5C%5C%5C%5C%5CRightarrow%20171.4%5C%25)
Thus, the percentage increase in time is ![171.4\%](https://tex.z-dn.net/?f=171.4%5C%25)