Andre has eight polished rocks at home. how many ways can he choose four of them to take to a rock and gemstone show? a)35 b)70 c)16,480 d)40,320

i pretty sure it is

isaiah walks 3 miles due north, turns and then 5 miles due east. how far is he from his starting point?

a^2 + b^2 = c^2

let c = distance from starting point.

(3)^2 + (5)^2 = c^2

9 + 25 = c^2

34 = c^2

sqrt{34} = sqrt{c^2}

sqrt{34} = c