I think he lost $375 because I'm pretty sure your supposed to multiply 55 and 7
I will assume that we are trying to find the slope between (-9,2) and (9, 2)
The slope's equation ⇒ 
<u>Let's set the variables</u>:
(x1, y1) --> (-9, 2)
(x2, y2) --> (9, 2)
<u>Now let's plug them in:</u>

<u>Thus the slope of the line is 0.</u>
Hope that helps!
Answer:
it should be 90
Step-by-step explanation:
I hope this helps!
Hi there!
nickels:19
We know that there is only nickels and dimes in his coin collection..
<u><em>1.Multiply two terms:</em></u>
<u><em /></u>
<u><em>·</em></u>
<u><em /></u>
<u><em>Then there would be 20 nickels but 1+1=2 not 2.05.</em></u>
<u><em>2.Multiply the terms:</em></u>
<u><em /></u>
<u><em>·</em></u>
<u><em /></u>
<u><em /></u>
<u><em>·</em></u>
<u><em /></u>
<u><em>3.Combine the two terms:</em></u>
<u><em /></u>
<u><em /></u>
Therefore, there would be 19 nickels...
<u><em /></u>