First some rewriting:

We see that the numerators of both fractions
and a term in the denominators
will cancel:

Then

Answer:
The answer is A cos(A)cos(B)
Step-by-step explanation:
I just took it
Answer:
86.9 km/h
Step-by-step explanation:
54 mph = 86.9046
Full number: 86.9046 km/h
First lets substitute the value of the variable; (t=12)

Now lets solve the equation;

Next cross simplify;

So
9 is the final answer! Hope this helps!