Answer:
Part 1)

Part 2)

Step-by-step explanation:
Part 1)
So we have the two functions:

And we want to find:

This is the same as:

Substitute:

So, our answer for Part A is:

Part 2)
Let's find our difference.
Distribute the -1:

Combine like terms:

Add:

And we're done!
Answer:
angle j = 90
angle k = 29
angle L = 61
Step-by-step explanation:
180 = 90 + (4x-19) + (5x+1)
90 = 9x - 18
108 = 9x
x = 12
2/3 (3x-5)=3
x=19/6
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