Answer:
x = 3
Step-by-step explanation:
4x+2 = x+11
Subtract x from each side
4x+2-x = x+11-x
3x+2 =11
Subtract 2 from each side
3x+2-2 =11-2
3x = 9
Divide by 3
3x/3 =9/3
x = 3
Answer: 36 sq
Step-by-step explanation: you add 24 to 12 and get 36

The formula of the sum of the arithmetic sequence:

calculate:

substitute

Your answer is:
Answer:
56
Step-by-step explanation: