Arctan(3.4) ≈ 73.6°. You can view the 3.4 as the slope of a line. Then it is clear the the 52.9 and 99.8 can't be right. If you have to do this without a calculator, it can be quite tricky...
You are multiplying 2 to each term each time.
-40 is the 4th term
-40 x 2 = -80
-80 x 2 = - 160
-160 x 2 = -320
-320 x 2 = -640
-640 x 2 = -1280
-1280 x 2 = -2560
-2560 x 2 = -5120
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-5120 is your 11th term.
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hope this helps
If we write the bigger number as x, and the smaller number as y, we can write it as simultaneous equations.
So, if the difference is 5, we can say that
x-y=5
And if five times the smaller number minus the greater number is 7, then we can write that as
5y-x=7
You can add these together to get 4y=12, and if we simplify, we get y=3.
We know that the difference is 5, so 3+5=8.
Therefore, Ethan's numbers are 3 and 8.
the answer is A. 78 :) I worked it all out