exam Maths Puzzle Numerical Ability

Directions : angle a and b are complementary find measure of
measure of angle a = 3x - 7 and the measure of angle b is 11x - 1

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Hi i need help on my homework.

The problem is:

d=rt for r

Would you pleaseeeee send me a soulution in detail

thanks alot,
softballcutie Line segment MS and line segment NR are medians of triangle MNK. If MS = 15, NR = 18, and MN = 21. what is the perimeter of triangle PRS?