Which is the BEST estimate of the average rate of change for the function given in the table, over the interval 2 ≤ x ≤ 6?

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance