The answer is )A
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The answer is 30 60 and 90 because those are the only 3 numbers that are divisible by both 3 and 10 and are two digits.
Here’s an easy tip.
Always know that the angles next to each other, for example,AB, DC, AD& BC always equal to 180 degrees when added together.
So, we know that angle A plus angle B is 180.
Lets set it up.
2x+1+148=180
Combine like terms.
2x+ 149= 180
Subtract 149 from each side.
2x= 31
X= 15.5 degrees
