If you factor 3y from each of these, you should get (8x^2) and (5y). These are completely simplified.
Your greatest common factor is 3y
Angle ADB is a right angle --- Given
Angle ADB is 90 degrees --- Definition of a Right Angle
Angle CDB is 90 degrees --- Definition of Supplementary Angles
Angle ADB = Angle CDB --- Definition of Congruent Angles
Proofs can be tricky! What helps me is thinking through them step by step and how I would prove I did something. While I'm not entirely sure what options you have for this proof, I've given my best guess.
Hope this helps!! :)
Using the Pythagorean therom.

81 + b^{2} = 196
b^{2} = 115
b =

Hope this helps!
Answer:
5k + 9
Step-by-step explanation:
3k + 4 + 2k + 5 =
= 5k + 9
Answer:
157/270
Step-by-step explanation: