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satela [25.4K]
3 years ago
5

If y varies directly as x and y=12 when x=72, find x when y=9

Mathematics
2 answers:
mafiozo [28]3 years ago
8 0
You can do 12/72 = 9/x. You cross multiply and it becomes 12x = 648. Divide 648 by 12, and x equals 54.
lapo4ka [179]3 years ago
5 0
9 x 72 = 648

648 ÷ 12 = 54

x = 54

Hope this helps :)
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postnew [5]

Answer:

Below

Step-by-step explanation:

Substituting the given values:

f(6) = 6(2/3) - 2 =   cube root of 6^2 - 2 = cube root 36 - 2

f(-6)=  (-6)(2/3) - 2 =   cube root of(-6)^2 - 2 = cube root 36 - 2

So This is true,

f(6) =   cube root of 6^2 - 2 = cube root 36 - 2 = 1.3019

2 * f(3) = 2 *  (cube root of 3^2 - 2 )  =  2 * (cube root of 9 - 2) = 0.1602

So False,

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