102 + 15
=> 100+15
=> 115 ans
"Second power" means that you multiply something with itself. In this case, (10 + 15) (10 + 15).
15
s = 20
15 + 15 + (10 * (1 / 2)) + (10 * (1 / 2)) = 40
== A number to the second power means 'squared,' so it is 15 x 15, which is 225. == 15 to the second power is nothing but 15 squared.152 = (15 * 15) = 225. Therefore 15 to the second power is 225.225
10 + 15 + 20 = 45
42
5 to the power of 2 plus 15 to the power of 2 = 250
25 + 15 + 21 + 10 + 11 = 82
10
15
18 + 10 + 20 + 30 + 15 + 50= 143