Evaluate the following.
(a) |7 - 9
(b) |7| - 9

Renee hiked for 6 3/4 miles. after resting, renee hiked back along the same route for 5 1/4 miles. how many more miles does renee need to hike to return to the place where she started? represent your answer as a simplified mixed number, if necessary.

In cents, what is the least total amount that cannot be obtained by using a combination of fewer than eight coins from a collection of pennies, nickels, dimes and quarters?

Without graphing, identify the quadrant in which the point (x, y) lies if x < 0 and y < 0.