It is: 1.55+10 = 17.59375
12 over 15
2/3 + 1/5 = 10/15 + 3/15 = 13/15
"Second power" means that you multiply something with itself. In this case, (10 + 15) (10 + 15).
8
102 + 15 => 100+15 => 115 ans
6/30 + 10/30 = 16/30 or 8/15
1.5 + 2.6 = 4.1 3/2 = 15/10 13/5 = 26/10 15/10 + 26/10 = 41/10 = 4 and 1/10
s = 20
(1/5) + (2/3) = (3/15) + (10/15) = 13/15
15 + 15 + (10 * (1 / 2)) + (10 * (1 / 2)) = 40
14/15
11/15