How do i find the answer of this math question or problem f(x) = 4x − 9?

x = 9/4

Step-by-step explanation:

f(x) = 4x - 9

(first substitute f(x) with 0)

0 = 4× - 9

(Move four)

-4x = -9

=> x = -9/-4

= 9/4

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

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step-by-step explanation: