The value of y varies directly with x. if x=6, then y=21. if x=10,what would be the value of y

When x = 12, y = 4.

Explanation:

If  y  ∝  x  we can write that  y = k ⋅ x  where k is a constant of proportionality.

Using the values given:

6 =18 ⋅ k ⇒ k = 1 3  y = 1 3 ⋅ 12 = 4

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

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