Answer:
<u>Problem 1.</u>
If the plane can still load p no. of passengers , then,
p ≤ 78
<u>Problem 2</u>
With 6 servings of wings, Sarah can serve maximum 2 burgers.
<u>Problem 3</u>
x > 10 [where the passenger travels x miles by either Uber or Lift car]
Step-by-step explanation:
<u>Problem 1</u>
Let, the no. of passengers that the plane can still load is p.
Then, according to the question,
p ≤ (118 - 40)
⇒ p ≤ 78
<u>Problem 2</u>
Let, Sarah can serve x no. of wings and y no. of burgers.
Then according to the question,
6x + 3y < 45 ------------(1) and
x ≥ 4 --------------(2)
Now, for 6 servings of wings or for x = 6,
from (1)
3y < 9
⇒ y < 3
So, with 6 servings of wings, Sarah can serve maximum 2 burgers.
<u>Problem 3</u>
For, going x miles the Uber driver charges,
$ ( 3 + 0.5x)
while the Lift driver charges,
$ ( 2 + 0.6x)
So, the cost of Lift is greater than Uber when
2 + 0.6x > 3 + 0.5x
⇒0.1x > 1
⇒x > 10
