Answer :
SOLUTION
The expression
Nine less than the product of a number and 4 can be written as
Defined a parameter for the unknown
[tex]\text{Let the number be n}[/tex]The product of 4 and the number is
[tex]4\times n=4n[/tex]Then
Nine less than the product means to subtract 9 from the product
Hence
[tex]4n-9[/tex]Therefore
The expression nine less than the product of a number and 4 is written as
4n-9
The right answer is A