Answer:
40°
Step-by-step explanation:
The reference angle is the positive acute angle created by the terminal arm and the x-axis.
The highlighted red in the picture below shows what we're looking for.
The arm rotated 220° (but 'backwards' so the value given is negative). 
|-220°| - 2(90°)          <= Subtract two right angles for two quadrants
= 220° - 2(90°)
= 220° - 180°
= 40°
Therefore, the reference angle is 40°.
If you got 50°, you probably calculated the angle with the terminal arm and the y-axis. Remember to always use the nearest side of the x-axis!
 
        
             
        
        
        
Answer:
150 is 100% of 150
Steps to solve "150 is 100 percent of what number?"
We have, 100% × x = 150
or, 
100
100
 × x = 150
Multiplying both sides by 100 and dividing both sides by 100,
we have x = 150 × 
100
100
x = 150
If you are using a calculator, simply enter 150×100÷100, which will give you the answer.
 
        
             
        
        
        
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Answer:
Step-by-step explanation:
5x+14<4 or -2(x-8)<-2
     -14 -14      -2x+16<-2
5x<-10                -16  -16
÷5  ÷5           -2x<-18
x<-2              ÷-2   ÷-2
                      x>9   (sign changes because you divide by a negative number)
x<-2 or x>9