Two roads r1 and r2 and the streets between them s1 s2 s3 and s4 are shown. The intersections, represented by the points, lie on a circle, with the intersection of the four streets at the center of the circle shown. What is the measure of angle a between the two roads A 15
B 30
C 38
D 54
E 68

Anut store normally sells cashews for? $4.00 per pound and peanuts for? $1.50 per pound. but at the end of the month the peanuts had not sold? well, so, in order to sell 40 pounds of? peanuts, the manager decided to mix the 40 pounds of peanuts with some cashews and sell the mixture for $2.00 per pound. how many pounds of cashews should be mixed with the peanuts to ensure no change in the? profit?