8 - 7x^2 + 3 = 4x^2 - 1
8+3-7x^2 = 4x^2-1
11-7x^2 = 4x^2-1
B. Commutative property of addition
We can swap numbers and obtain the same results.
In this case, we swapped 8+3 and added them.
Increased by 5%
1930*5/100= 96.5
1930+96.5=2026.5
Further increase by 15%
2026.5*15/100=303.975
2026.5+303.975=2330.475
To 2DP= 2330.48
Possibilities
20,21,22,23,24,25,26,27,28
2 remove all even
21,23,25,27
3 rules out 21 and 27
23,25
5 pulls out 25
23 is the answer
