1) 1/4+1/2
We need to convert the fractions.
1/4 is fine.
1 x 2=2
2 x 2=4
1/4+2/4=3/4
2) a+a
a can be written as 1a.
1a+1a=2a
I can't see photos and he doesn't know 3 or 4 and i'm confused on 5.
a=?
Hope it helps?
Answer:

Step-by-step explanation:
Answer: 62
Step-by-step explanation:
You do 112-19-31 and then it equal = 62
Answer:
170 cm
Step-by-step explanation:
160+.06*160=160+9.6=169.6
Answer:
2000J
Step-by-step explanation:
mg=500
h(height)=4
500 x 4 = 2000J