Answer:
10.3
Step-by-step explanation:
Just substitute "x" with "3".
y = 2.4x + 3.1
y = 2.4(3) +3.1
y = 7.2 + 3.1
y= 10.3
Answer: 10.3 minutes
159
k (9) = (2 * ) - 3
= (2 * 81) - 3
= 162 - 3
= 159
Y means profits and x is the number sold.
(2$ times x) - 7=y.
It would be 14 because since each book is 3.5cm thick times that by 4 and get 14.