If you would like to calculate 6 5/6 + 6 11/12, you can do this using the following steps:
<span>6 5/6 + 6 11/12 = 41/6 + 83/12 = 82/12 + 83/12 = 165/12 = 55/4 = 13 3/4
</span>
The correct result would be 55/4.
Step-by-step explanation:
Let x be the next exam's score.
We have 81 + 85 + 91 + x > 4(85).
=> 257 + x > 340
=> x > 83
Therefore the student must score above 83.
Straight line equation has a general form of

Where m is the slope

and c is the y intercepted part.
So now, you need to find the value of the slope (m) and the y intercept (c).
As you can notice the line intercepts with y axis in (0,1) So c=1.
And then you want to find 2 points along that line to found the slope from, we found on already (0,1) and the other one can be any point along the line, let's take (2,3).
Then use them to find the slope.

So now
m=1 and c=1.
The equation of this line is y=x+1
Hope this helps!
Answer:
the tax on $35.00 at 9.75% rate
35.00*9.75 = 315.75