I'm confused on why the 10 is there?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?

Mia’s gross pay is 2953 her deductions total 724.15 what percent if her gross pay is take-home pay