Can someone answer 14, 15 and 16 for me?

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

List the sides of δrst in in ascending order (shortest to longest) if: a ∠r =x+28°, m∠s = 2x+16°, and m∠t = x+12°

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin