Instead of subtracting 6 from 12 then dividing they added 6 to 12 & ended up with 18. 18 by 2 is 9.
The answer is 64x^2+114x+81. Hope this helps.
90*1566=140,940 because how many means times
The average is 105.5. To find the average, you have to add up all numbers, 63+148=211. Now you have to divide by how many numbers there are, 211÷2=105.5
The second answer I believe. Sorry if I am wrong.