Select the choice that best completes the following sentence. simple machines

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)

In an experiment, how can i change human errors? be specific.