The quantity z varies jointly with x and y. If x=-1 and y=-9, and z=-36, find z when x=2 and y=-1.

8

Step-by-step explanation:

let's say xy = kz

when x = -1 and y = -9, then z = -36

so,

xy = kz

(-1)×(-9) = k×(-36)

9 = -36k

k = -1/4

when, x=2 and y=-1

(2)×(-1)=(-1/4)×z

-2=-z/4

z = 8

Answered by GAUTHMATH

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft

answer would be 8.64 or s = 11π/4 inches

step-by-step explanation:

s = r θ  

where s = arc length  

r = radius = 3 inches  

θ = central angle in radians = ( π /180)*165  

s = 3(π/180)*165  

= 8.64 inches