Write an expression.

Question

Cory earns $30 a day babysitting his sister and an extra $20 a day for each neighbor's child he watches after school. Write an expression to represent this situation.

Answer 1

Here are our factors for the equation:

-- 30 is our constant for watching his sister. The variable is the number of neighborhood children in addition to his sister, so we'll call that 'n.'

-- He get's paid a certain amount of money dependent on the total number of children watched, so we'll call the money 'm.'

-- Every child gives him another $20, so 20 * n, or 20n.

Spoken, the amount of money he makes is equal to thirty dollars plus another 20 for every neighborhood child, or:

m = 20n + 30