1. the square root of 40 + the square root of 60

2. the if the legs are 3,4 whats the hypotenuse
3. 8 x 10^7 + 1 x 10^5

1. √40 + √60 = √4 * √10 + √4 * √15 = 2√10 + 2√15 = 2(√10 + √15)

2. Using the Pythagorean theorem: c^2 = a^2 + b^2
c^2 = 3^2 + 4^2
c^2 = 9 + 16
c^2 = 25
c = √25
c = 5

Therefore, the hypotenuse is 5.

3. 8 x 10^7 + 1 x 10^5 = 80,000,000 + 100,000 = 80,100,000