Answer: 40
Step-by-step explanation:
Given
Jar contains 200 old dimes
Chances to pick the 1960s is 20% i.e. 1960s is 20% of 200 old dimes
So, we can write

Answer:
Step-by-step explanation:
37.99 * 25%= 9.497 or $9.50 tip
D+Q=61 => D=61-Q
3+D=Q
10D+25Q=1090
10(61-Q) + 25Q=1090
610-10Q+25Q=1090
610+15Q=1090
-610 -610
15Q=480
480/15=32
32 quarters
Website Math papa can help w that
You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb