I am unsure about the very last problem but I can help with the first two
1) (y+1)+4
If we combine the numbers 1 and 4, we get +5 and can isolate the numbers from the variable.
This would give us

2) (6*r)*7
remember that we do not have to explicitly state 6*r
Instead, we can write it as 6r
this helps us get rid of the parentheses
now we can write it as

I hope this helps!:)
Answer:
k k hhi i i kjh hi hi pi i i hi hi kp i pi hj
Answer:
18m
Step-by-step explanation:
113.04m/3.14 = 36m/4m = 9m*2 = 18m
Answer:
729 in ^3
Step-by-step explanation: