Which graph showed exponential growth

Pls super important solve the botton one

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

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)