B=61
12
b= 4
3b+4 = b+12 3b-b = 12-4 2b = 8 b = 4
b = 14
b = sqrt32 or 4 root 2
12
Addition is commutative. That is, a + b = b + a for all a, b
b = 12 12(3)+3 = 39, use a calculator to find out
b= 4
3b+4 = b+12 3b-b = 12-4 2b = 8 b = 4
4
1.5
* a2 + b2 = c2 * a = 3 * b = 8 * (3)2 + (8)2 = c2 * 9 + 64 = c2 * 73 = c2 * c = √73
12
b = 14
b = sqrt32 or 4 root 2
b + 9 = 21 Take the + 9 across the other side of the equals sign. a plus becomes a minus. b = 21 - 9 so... b = 12. This can be checked by setting b to 12 in the first equation b + 9 = 21 12 + 9 = 21 which is correct.