Write the expression. Then, check all that apply. Six times the sum of nine and a number

6(9+x)

Explination:

The question asks you to add 9 to an unknown number...since you donʻt know that number you use the letter x. The question asks you to multiply 6 by the SUM of 9 + a number (x) so you have to put 9+x in parentheses, because acording to the order of operations you do parentheses first. After you put it all together you get the answer of: 6(9+x)

step-by-step explanation:

i found the koficent of the linear function and i foun c acordind to the strict formula y=kx+c and then i took 2 as an x and replacet it on the formula i found and then foun the y