Find the measure of angle b
b/50

130°

Step-by-step explanation:

Angles in a straight line are supplementary to each other. Those angles are also called as Linear Pairs. Here , b & 50° are linear pairs.

So ,

b + 50° = 180°

=> b = 180° - 50°

=> b = 130°

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.