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Please help quick. whats the answer and how do u do it? QUICK HELP MATH

Please Help Quick Whats The Answer And How Do U Do It QUICK HELP MATH class=

Sagot :

Answer:

∠E = 77°

Step-by-step explanation:

You set the angles equal to each other:

9x - 5 = 8x + 4

x = 9

You also know that all angles in a triangle add up to 180°, so:

3x + (9x - 5) + ∠E = 180

3(9) + (9(9) - 5) + ∠E = 180

27 + 76 + ∠E = 180

∠E = 180 - 76 - 27

∠E = 77°