Question

Margo is picking up 600 -ohm resistors for a physics project . (Ohms are the units used to measure circuit resistance.) The package guarantees that the actual resistance is within 10% of the package rating. Which of the following inequalities best models the range of resistances, r?

Answer 1

B

Explanation:

Resistance tolerance (like 10%) means that the value is 10% either side of the color coded value.

10% of 600 = 10/100 * 600 = 60

So the highest value can be 600 + 60 or 660

The lowest value is 600 - 60 = 540

The answer is

540 <= r <= 660