Will mark brainiliest! 1. y varies jointly as x and z.

see explanation

Step-by-step explanation:

since y varies jointly as x and z , then the equation connecting them is

y = kxz ← k is the constant of variation

to find k , use the row x = 5, y = 52.5, z = 7

k = = = 1.5, hence

y = 1.5xz ← equation of variation

first row, to find y with x = 2, z = 4

y = 1.5 × 2 × 4 = 12

third row, to find z with x = 1.5, y = - 36

-36 = 1.5 × 1.5z

z = = - 16

fourth row, to find x with y = 1.38, z = 23

1.38 = 1.5 × 23x

x = = 0.04

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step-by-step explanation:

just for that im not answering