3 years ago

I WILL GIVE BRAINLIEST

Mathematics

2 answers:

kirza4 [7]3 years ago

4 0

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

Luden [163]3 years ago

3 0

$r/5=9/21 \\r/5=3/7 \\r=(3\cdot5)/7=\boxed{15/7} \\$

The answer is A.

Hope this helps.

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