Answer:
Step-by-step explanation:
Remark
You have to assume nothing you should have to assume. You have to assume that 93 degrees on 3x + 18 sit on the same straight line. If it just looks that way, you are on shaky ground. You must be told. It's a good thing to keep in mind. Likely you'll get more questions like this. Just be aware you should not have to assume anything to make the problem work.
If the two angles both have one leg on what is marked as a straight line, then the sum of the two angles must = 180
Solution
The first one is not true. 3x + 18 is smaller than 90 degrees because 93 is more than 90 degrees. If A is true then the line is bent a bit.
B is not true. We just found one equation that doesn't work.
C is not true either. The result of trying to solve C will make x minus because 93>90 and 18 when subtracted makes 3x even more minus.
D is true
(3x + 18) + 93 = 180 Subtract 93 from both sides.
(3x + 18) + 93-93 = 180 - 93 Combine
(3x + 18) = 87 Remove the brackets
3x + 18 = 87 Subtract 18
3x+18-18 = 87-18
3x = 69 Divide by 3
3x/3 = 69/3
Answerx = 23
E is not true because D is true.
