Answer:
Option C.
Step-by-step explanation:
<span>-8(5r+6)+9(6r+3)
= -40r - 48 + 54r + 27
= 14r - 21</span>
Answer:
<em>2.5 hours</em>
<u>Skills needed: Speed, distance, time problems</u>
Step-by-step explanation:
1) We are given speed and distance, and have to find out the the time (in hours).
- In terms of units, everything is matched up (Since distance and speed use kilometers, and speed and time use hours).
- Time is always the distance you travelled (how far) divided by how fast you travelled (the rate/speed)
---> We can use the formula for time: ![t=\frac{d}r](https://tex.z-dn.net/?f=t%3D%5Cfrac%7Bd%7Dr)
t= time
d=distance
r=rate/speed
2) Now, let's plug in for distance and rate.
---> ![t=\frac{7.5}{3} = 2.5](https://tex.z-dn.net/?f=t%3D%5Cfrac%7B7.5%7D%7B3%7D%20%3D%202.5)
2.5 hours is the answer.
Have you ever heard the tragedy of darth plagues the wise