Hi there.
I'm just going to put the answer for now. I might come back and edit my answer if I figure out how to solve this the long way.
All I did was figure out what exponent you raise 10 to.
10³ = 1000
So, we now have 8 + 10³ = 1008
Edit:
I did it on paper - here it is broken down.
8 +

= 1008
Subtract 8 from both sides.

= 1000
We know that 10³ = 1000
<em>x</em> = 3
~
Two straight lines perpendicular to each other, the slope of which is negative reciprocal.
y=-4/3x+b
The known points are put into the linear equation
y=-4+b
b=13
y=-4/3x+13
You start at 4:04pm and end at 4:18pm. This means 14 minutes have passed
Now you had 275 word typed and now you have 765. To find the amount that were added simply subtract 765 by 275 and you'll get 490.
Finally, to find the average amount of words typed per minute, you'd divide 490 by 14 for each minute which is 35
Your answer is 35 words per minute