Starting at home jessica traveled uphill to the toy store for 12 minutes i just 10 mph period then she travel back home along the same path downhill at a speed of 30 mph period what is her average speed for the entire trip from home to the toys store and back

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Ascientist places 24 cells in a petri dish. she knows the cells grow at an exponential rate, doubling in number every hour. how long will it take (in hours) for there to be 1100 cells in the dish? time to 1100 cells: 5.51832530 hours how long will it take to reach 110 cells? time to 110 cells : 2.1963972 hours what is the average rate of change in the number of cells between 9 hours and 11 hours? average rate of change: cells per hour what is the instantaneous rate of change after 7 hours? instantaneous rate of change: cells per hour note: you can earn partial credit on this problem.