CPM Homework Help : ACC7 Problem 6-30

Write an algebraic expression for each situation. For example, $5$ less than a number can be expressed as $n-5$ .

$7$ more than a number
Hint (a):
This is similar to the given example.
What operation is used to make a number larger?

Twice a number
Hint (b):
What operation can you use to double a number?
Answer (b):
$2·x$