Sarah Ortiz works as a line worker in a factory. She earns $12.30 per hour. Last week she earned $430.50 straight-time pay. Find the number of hours worked by Sarah last week.

The length of each stair is 11 inches. what is the rise, r, for each stair? round to the nearest inch. 2 inches 7 inches 17 inches 24 inches

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %