I really need help on these problems.

An indoor physical fitness room consists of a rectangular region with a semicircle on 6-146. each end. The perimeter of the room is to be a 200 meter running track. Let A be the area of the rectangular region. Label all parts of the diagram. Note that x is the radius of the circular portion. a. Solve for y in terms of x. b. Express A as a function of x. 6-147. Two logs of radius 80 cm and 20 cm have a single D C wire around them as shown in the figure at right. Find the length of the wire. Hint: ZACD and ZBDC are right angles. Draw a line through B parallel to CD meeting AC at E. 6-148. Solve the following equations for k. a. 5. 3( *+2 ) = k. 3x Web. 6. 2 ( x+*) = 24 . 2*