Answer:
a
Step-by-step explanation:
To isolate b, add a and subtract c to the entire equation:
D - a + c = -b
Muliply b by -1 to eliminate the negative:
-D + a - c = b
Answer: x > 74
<u>Step-by-step explanation:</u>
An obtuse angle is greater than 180°. So, 3x - 42 must be greater than 180.
- 3x - 42 > 180
- <u> +42 +42</u>
- 3x > 222
- <u>÷3 ÷3</u>
- x > 74