Answer:
Time taken by his friend to create the app alone = 48 hours.
Step-by-step explanation:
Hours needed by Jacob to create an app = 24 hours

Let hours needed by his friend in creating the app alone = x hours

The both can create the app in 16 hours.

Hence, Time taken by his friend to create the app alone = 48 hours.
The strings cost $14. you would take the total cost ($72) and subtract the cost of the book ($16) and you would get $56. you would then divide 56 by the number of book bought (4 in all) and you would get $14.
Answer:
8 and 17
Step-by-step explanation:
Answer:
2x - 9
Step-by-step explanation:
7x - (9 + 5x) < distribute the - into the parentheses to get rid of them
7x - 9 - 5x < combine like terms
7x - 5x = 2x
-9 stays as it is as there are no other terms to combine it with
the answer is 2x - 9