1.find a b if a = 3i + 8j and b = -0.5i - 4j. 2.the given point p is located on the unit circle. find sin theta and cos theta p(24/25, 7/25) 3.sheila is building a triangular sandbox in her backyard. she has obtained the measurements in the diagram below. the angle is measured in degrees. what is the unknown side length (x)? round the answer to the nearest tenth. two sides 6 ft, 5ft angle 70 a5.6 ft b6.4 ft c31.5 ft d40.5 ft