Answer:
1. t=240
2.t/3=(t/4)+20
Step-by-step explanation:
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:
the answer is 0.9988747935
hope that works!!
86 degrees Fahrenheit is 30 degrees Celsius
25 minutes!! you were very close, you just needed to translate the fraction to minutes!