Round off the decimals to a sensible number.
So 3.7 would be 4 and 10.2 would be 10.
In this case, it would be (2 × 4 + 8) × 10 which is 160.
yes obtuse angles measure over 90 degrees and less 180 degrees
If you use/make a number line, then you will see that the answer is -18 or a. When using a number line, negative = ← and positive = →.