Answer: AC=12 cm
Step-by-step explanation:
To solve this problem you must apply the law of sines, as you can see below:

Where:
a=13
A=85.2°
B=71.6°
Therefore, you must solve for b, then, you obtain that the lenght AC asked in the problem above is:

Answer:
The LCD in 1/30 + 1/24 is <u>90</u>.
I think this is the answer ----> 8.7 (8.66 rounded)
The least common multiple is 2