Right away,

Recall that
, so
. We're told that
, for which we expect to have
and so we take the positive square root. Also recall that 3-4-5 is a Pythagorean triple. Then

We have everything we need to find the remaining trig ratios. With the help of double angle identities, we get



Answer:
Well, count out how many nickels can go in $3.90. Then count out how many quarters. Make sure there are 6 more quarters than nickels, and make sure it all adds up to $3.90
Hope this helped! <3
If the hat is 15% off, then he will pay = 100 - 15 = 85%
So, He is wrong (not correct)
Hope this helps!
Answer:
3
Step-by-step explanation: