7+5a+6b is the answer because 16-9 is 7 and 8-3 is 5.
I can’t see the pic more can u edit it ms make it more bigger lol
Answer:
2.1 hrs
Step-by-step explanation:
In 1 hr, Phillip would have proofed 1/7 of the chapter. In 1 hr, Kim would have proofed 1/3 of the chapter. So, together in 1 hr, they would have proofed 10/21 of the chapter. So, it would take 21/10 or 2.1 hrs to proof the whole chapter together.
The answer would be 9 Permutation 3 (or 9P3) which is equal to 504 possible ways.