Solution: =====> -7 + {12 - 3[50 - 4(2 + 3) ] } ======> -85
Simplify :
−7 + 12 − 3(50 - 4(2 + 3))
= 5 − 3(50 − 4(2 + 3))
= 5 − 3(50 − (4)(5))
= 5 − 3(50 − 20)
= 5 − (3)(30)
= 5 − 90
= − 85
Answer ========> -85
Hope that helps!!!! : )
To convert a mixed fraction into an improper fraction:

The correct answer is B. 83
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!:)