Option B) 3 hours is the time spent by Jenna on the e-mail this week.
<u>Step-by-step explanation:</u>
Jenna spent 30 hours on the computer this week.
The amount of time she spends on computer to work on various fields in given in the pie-chart.
This 30 hours represents her 100% work on computer.
From the figure shown,
She spent 10% of her total work on e-mail.
Therefore, 10% of 30 is the work done in hours by her on e-mail.
⇒ (10/100) × 30
⇒ 0.1 × 30
⇒ 3 hours
∴ Option B) 3 hours is the time spent by Jenna on the e-mail this week.
Pizzas cost $8 and sandwiches cost $2.50
Just divide the number of parts made by the number of hours to get parts per hour. 15 minutes is 1/4 of an hour, so we divide 360 by 0.25 hours:
For this case we have the following equation:
![1 + 3x = -x + 4](https://tex.z-dn.net/?f=1%20%2B%203x%20%3D%20-x%20%2B%204)
We must solve the equation by following the steps below:
We subtract 1 from both sides of the equation:
![3x = -x + 4-1](https://tex.z-dn.net/?f=3x%20%3D%20-x%20%2B%204-1)
On the right side of the equation we have that different signs are subtracted and the sign of the major is placed:
![3x = -x + 3](https://tex.z-dn.net/?f=3x%20%3D%20-x%20%2B%203)
We add x to both sides of the equation:
![3x + x = 3\\4x = 3](https://tex.z-dn.net/?f=3x%20%2B%20x%20%3D%203%5C%5C4x%20%3D%203)
We divide between 4 on both sides of the equation:
![x = \frac {3} {4}](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%20%7B3%7D%20%7B4%7D)
Thus, the correct option is option B
Answer:
![x = \frac {3} {4}](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%20%7B3%7D%20%7B4%7D)
Option B