The perimeter of the trapezoid below is $27$27 centimeters.

Write a linear equation in standard form, $Ax+By=C$Ax+By=C, for the perimeter.

Find $y$y if $x$x is $5$5 cm.

A carpenter charges a callout fee of $£150$£150 plus $£45$£45 per hour.

The table shows the linear relationship between the number of plastic chairs manufactured and the total manufacturing cost.

The table shows the water level of a well that is being emptied at a constant rate with a pump.