Kathy sends and receives 18 calls in 3 days. Determine the missing value to see how many texts she sends and receives in 32 days.

not sure but it may be b, as i said i'm not sure.

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