Answer: The length is 3 or 9 hope this helps.
Step-by-step explanation:
I'm going to assume you've learn sin, cos, and tan. To find a you must do:

Once you find a, you can use the Pythagorean Theorem to find b:

Or you can do:

You can find these functions on a scientific calculator. Let me now if you need more help.
Answer:
c shows 3
Step-by-step explanation:
3.26d+9.75d-2.65
=13.01d−2.65
Answer:
a) 20
Step-by-step explanation:
Use similar triangles.
2/3 = x/30
3x = 2 * 30
3x = 60
x = 20
Answer: a) 20