Hello i just need help with this question please and thank you

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Step-by-step explanation:

<2 + <3 = <1. it doesn't say if <1 is also 90º but you know it will be because the measure of a line if 180º so just add and subtract, you'll see that <1 is 90º.

also <5 = <3 because of vertical angles.

<6+<7 = 180º (straight line definition)

<9 = <11, < 8 = <10 both vertical angles

hope this helps, ask if you need additional help!!

what i would say the best answer is a. 40.5