Help plz I’ll give the brainlest thing

The isosceles triangle has two sides of equal length, a, that sre longer than the length of the base ,b. the equation 2a+b=15.7 can be used to find the sides length. if one of the longer sides is 6.3 centimeters what is the length of the base

A(t)=728(1+0.04)^t how much money did aditya originally invest

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?