I think the first one might be 18 second might be 10
Sum is addition, less than is subtraction, equals is is, division is of and multiplication is per
Answer:
C: 
Step-by-step explanation:

Since a =
:

Since n = 4 :

Answer:

Step-by-step explanation:
distribute 2 into (4x+2) and -12 into (x-1)
8x+4=4x-12x+12
combine like terms
8x+4=-8x+12
add -8x on both sides
8x+8x+4=12
16x+4=12
subtract 4 on both sides
16x=8
divide both sides by 16
x=1/2
hope this helps