Along distance phone company charges $4.99 per month plus 10 cents per minute. how much minutes were used in a month if the monthly bill is $16.99

Bill = 4.99 + .10x    where x is the number of minutes spent on the phone

16.99 = 4.99 + .10x          Subtract 4.99 from both sides

14.00 = .10x            Divide both sides by .10

140 = x  

Answer is 140 minutes

ratio is 2 : 9

the answer is three

13.5 : 3

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