The time t (in days) that it takes to harvest a field varies inversely with the number n
of farm workers. A farmer can harvest his
crop in 20 days with 7 farm workers. How
long will it take to harvest the crop if he
hires 10 farm workers? Show work to
support your answer.

The sum of each of the angles in a triangle always equals 180. We are given angles A and C so all we need to do is add them together and subtract from 180 to find the missing angle.

Angle C is 34
Angle A is 90 (that little box indicates 90)
34+90=124
180-124=56

Ange B is 56 degrees.

Hope this helps!!