Gianna and Matthew work at a dry cleaners ironing shirts. Gianna can iron 30 shirts
per hour, and Matthew can iron 10 shirts per hour. Gianna and Matthew worked a
combined 11 hours and ironed 230 shirts. Determine the number of hours Gianna
worked and the number of hours Matthew worked.

Gianna worked 6 hours and Matthew worked 5 hours.

Step-by-step explanation:

Let be "g" the number of hours Gianna worked and "m" the number of hours that Matthew worked.

Using the information given in the exercise, set up a System of equations:

You can use the Elimination Method to solve the System of equations:

1. You can multiply the first equation by -10.

2. Then you must add both equations.

3. You must solve for "g".

Then:

 4. Finally, you need to substute the value of "g" into any original equation and solve for "m" in order to find its value:

answer: .75 km

step-by-step explanation:

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.