31/8+2 2/6= how do you solve this problem and 2 ways to solve this problem

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

Which number is located at point a on the number line? a number line is shown from negative 10 to 10 with each interval mark on the number line representing one unit. point a is labeled one interval mark to the right of negative 5.

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.