Answer:
36.86989765
Step-by-step explanation:
As Angle GBC = Angle CDF = 45, so CF = CD as it is an isosceles right triangle , then as sin(45) = 1/root(2), so CF = 12, then tan(angle ECF) = FE/CF = 9/12, then angle ECF = tan^-1 (9/12) = 36.86989765.
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what grade is this
25
because there are vertical angles
Answer: 2a^2+22a+−1
Let's simplify step-by-step.
2a^2−5a+(9)(3)a−1
=2a^2+−5a+27a+−1
Combine Like Terms:
=(2a^2)+(−5a+27a)+(−1)
=2a^2+22a+−1
