sign operations

A hungry Emperor penguin was swimming 21 feet below sea level. It swam up 9 feet to eat a fish. What is the position of the penguin now relative to sea level? 21 feet below is written as -21 9 feet up is written as +9 So we have -21 + 9 = -12 or 12 feet below sea level

Lanette walked forward 9 steps, backward 15 steps, forward 7 steps, and backward 8 steps. How many steps is lanette from where she started? We use (+) for forward steps and (-) for backward steps Forward 9, backward 15 is: +9 - 15 = -6 Forward 7 steps is: -6 + 7 = +1 Backward 8 steps = +1 - 8...