You multiply 10.5 by 20 and get 210, that is your answer.
I believe the 3rd answer down if the information you provided is correct
Squaring the sum on the top, rules out 1 and 2 (not squaring the 7 only)
then 4 times the difference. so I believe 4 (x-1) on the bottom.
Answer:
1 2/3 hope this helps and have a wonderful day
Answer:
answer is first option

wherein, a = 1, b = -3, c = -5