Help pls Ix would really appreciate

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

Is there a direction u in which the rate of change of f(x, y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.