There are two parts in the given collection. One contains quarters and other contains dimes.
Let's compare the whole coin collection to the quarters.
One way to represent the ratio is 15 : 7.
The other way is 
Answer: -0.22222222...
Step-by-step explanation:
-2 over 9 can be written as -2/9
So that’s basically -2 divided by 9. If you’d do long division properly, you should get -0.22222222...
Answer: The answer should be B
Answer:
22.5 degrees
Step-by-step explanation:
Complementary angles add up to be 90 degrees. You can model the simple equation
where is x is the small angle and 3x is the large angle.

the smaller angle is 22.5 degrees
Answer:
It mean's numeric form with exponents.
Step-by-step explanation:
Basically it's a way to write the number better without having to repeat it.