Oscar has $30 from his allowance. There is a video game he wants to buy that costs $17.99, a chocolate bar that costs $0.79 and a remote control car that costs $8.99.

Step-by-step explanation:

Given

Required [Missing from the question]

What is his balance after purchasing the items

First, calculate total cost of items

The balance is then calculated as:

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.

so, converting firstly the mixed fractions to improper fractions and then "adding".