A metro train ride costs $4. After the ride, your card has a balance of –$3. Find your balance before the train ride.

Is the figure congruent? yes or no?

Which expression is rational? 6. , square root two, square root 14, square root 49

Find the volume of the solid obtained by rotating the region enclosed by the curves y=1x and y=7^-x about the x-axis. (use symbolic notation and fractions where needed.) volume =