I need to figure out how to solve this and the answer

C=13

Step-by-step explanation:

Ok, so those to angles are going to equal 90*.

First, you wan to setup your equation,

(2c-4) + (5c+3) = 90

now you want to add the angles

7c -1 = 90

isolate the variable .

Add 1 to both sides

7c=91

Now divide 7 from both sides

c=13.

To check our work we will plug in for C.

2(13)-4 + 5(13)+3=90

26 - 4 + 65 + 3=90

90=90

im pretty sure it would be 5 am, hope that , and give brainliest and guys if this is right then press the button and give 5 stars

m∠a is 90°

m∠b is 40°