Answer: b
Step-by-step explanation:

- Now, we know cos(60°) =
. So put the value there.

Hence LHS = RHS [Proved]
Hope you could understand.
If you have any query, feel free to ask.
Answer: Anna could buy 5 sweatshirts for $75.
Step-by-step explanation:
lets figure out the price of one sweatshirt.
45/3 = 15
one sweatshirt is $15
5*15=75
so 5 sweatshirts cost $75