Answer:
Step-by-step explanation:
The terms of this sum make the arithmetic sequence.
The fomula of a sum of <em>n</em> terms of an arithmetic sequence:
We have
Substitute:
What is this multiplacation?
2 answers:
You might be interested in
Dana can type 90 words per minute.
Since, 1 minute = hours
Therefore, number of words she can type =
= 90×60
= 5400 words per hour
If she types words in 'x' hours.
Number of words Dana types with the given speed in 'x' hours = Speed of typing × Time
=
Therefore,
hours
Therefore, Dana types words in 48.15 hours.
Learn more,