Solve for 7,8,& 9. show your work

7. suppose y varies directly as x. if y=3 when x=15, then find x when y = 5.
8. suppose y varies directly as x. find x when y =10 if y=-7 when x=-14.
9.suppose y varies directly as x. if x=15 when y=12, find x when y=21.

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x, y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis

Construct a box plot to represent the ages of the actors in a play. step 1: arrange the numbers in order from lowest (on the left) to highest. 24 18 30 26 24 33 32 44 25 28

24m^2n+30mn^2+18mn, a sweet challenge!