Use signed numbers to solve each problem. MAGNIFICATION A mechanic used an electr...

Use signed numbers to solve each problem.

MAGNIFICATION A mechanic used an electronic testing device to check the smog emissions of a car. The results of the test are displayed on a screen.

a. Find the high and low values for this test as shown on the screen.

b. By switching a setting, the picture on the screen can be magnified. What would be the new high and new low if every value were doubled?