Translate the word into a equation 15 is equal to 9 more than a number

Step-by-step explanation:

We'll go part by part.

"15 is equal to" so simple enough 15= now what is it equal to?

9 more than a number.  Well what does that mean?  it might help if we try out an actual number.  What is 9 more than 3?  12, so another way of writing that is +9.  It's not telling us the number we are adding 9 to so it's a variable.  So we'll say x + 9.

This leaves us with 15 = x + 9, which you could even solve.

what i would say the best answer is a. 40.5