14 Answer: 28
<u>Step-by-step explanation:</u>

15A Answer: 49
<u>Step-by-step explanation:</u>

15B Answer: 12
<u>Step-by-step explanation:</u>

16 Answer:
<u>Step-by-step explanation:</u>

Answer:
-1 x - 2
f (x) = -----------
3
Step-by-step explanation:
Then we have y = 3x + 2.
Next, interchange x and y, obtaining x = 3y + 2
Next, solve this result for y: 3y = x - 2; then divide both sides by 3:
y = (x-2)/3
Last, replace "y" with the inverse function label:
-1 x - 2
f (x) = -----------
3
Answer:
3 buses are needed.
Step-by-step explanation:
If there are only 2 buses, it would be full, but there would still be 12 students without a bus. To take all students, you'd need 3 buses. 2 buses will be full, and the other bus would only have 12 students.
Answer:
5°C
Step-by-step explanation:
We need to add 12 onto the -7:
-7 + 12 = 5