Plz help What is the volume of a sphere with a radius of 3 inches?

1210 cubic inches
241 cubic inches
361 cubic inches
481 cubic inches

What is sin 7x/4 ? i need on this urgent trig

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|