Answer:
Originally there were 30, 25 cents stamps and 20, 15 cent stamps.
Step-by-step explanation:
We are given the following in the question;
Let x be the number of 25 cents stamps and y be the number of 15 cents stamps.
Marci has a total 50 stamps.
Thus, we can write

Also,

Total cost = $16.50
Thus, we can write the equation:

Solving the two equations:

Originally,

Thus, originally there were 30, 25 cents stamps and 20, 15 cent stamps.
Answer:
Your answer
212960
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Step-by-step explanation:
3(4)+6
12+6
The answer is 18
Answer:
Extremely large and small numbers that have many zeros are long to write and take up a lot of room. So, by using scientific notation a number can be written shorter. For example, numbers such as 295,000,000,000 can be shortened to 2.95x
. This is easier to write and understand. This is why the scientific notation is used over standard.