Question

Six less than the product of 4 and a number is 9 . Use the variable C for the unknown number.

Answer 1

From this info, we can set up the equation
$4c - 6 = 9$

from here, we want to get c alone
so..
$4c = 15$
$c = \frac{15}{4}$
$c = 3.75$

Answer 2

The answer is 3.75

6+9= 15

15/4=3.75

Hope I helped :)