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Solve the following proportion.

r/5 = 9/21

A. r = 2.14

B.4 = 9

C. r = 11.66

D. r = 37.8

Respuesta :

r3t40

[tex]

r/5=9/21 \\

r/5=3/7 \\

r=(3\cdot5)/7=\boxed{15/7} \\

[/tex]

The answer is A.

Hope this helps.

Answer:

A. r=2.14

Step-by-step explanation:

As a first step - Cross multiplication.

21*r = 9*5

Move 21 to the right side

r=9*5/21

r=2.14

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