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:
both the first one
Step-by-step explanation:
use unit rate
Hey there! I'm happy to help!
To find the surface area of a sphere, here is what you do.
You square the radius.
4²=16
You multiply by 4.
16×4=64
And you multiply by pi!
64×π=64π
Therefore, the surface area of the sphere is A. 64π units². It's that easy!
Now you can find the surface area of a sphere! Have a wonderful day! :D
IF i did my math correct it should be the 2nd answer b
Answer:

Step-by-step explanation:
Given


Required
Solve graphically
See attachment for graph;
The black shade represents
While the green, represents 
Next, determine the intersection points between the two lines
From the attached graph, we have:

<em>Hence, the solution is:</em>