5x -20 + 2x -7
= 5x + 2x -20 -7
= 7x -27
ANSWER
<span>|x – 45| = 3; minimum angle: 42
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EXPLANATION
In general, the distance between two real numbers x and y is given by |x - y|.
Therefore, the distance between the launch angle, x, and 45 degrees is
|x - 45|
"Within three degrees" means the maximum and minimum angles are when the distance between x and 45 is 3 degrees. We set the distance to equal 3:
|x - 45| = 3
The minimum angle can be found using subtraction. 45 less than 3 is 42 degrees, so the minimum angle is 42 degrees.
42 degrees is within 3 degrees of 45 degrees. If we added 45, that would get us the maximum angle.</span>
Substitute 5 to the x:
f(5) = 5*5 - 3 = 25 - 3 = 22
A function will not have any repeating x values...it can have repeating y values, just not the x ones. In other words, ur x terms have to be all different.
A. .....this is a function
B.......not a function because u have repeating x values
C......this is a function
D......not a function because u have repeating x values
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