Brody made 4 stacks of wooden blocks. the first stack was 7 blocks tall. the second stack was 4 blocks taller the first. the third stack was 6 blocks shorter than the second stack, and the last stack was 9 blocks taller than the third stack. how many blocks did brody use in all?

Talia took the bus from her home to the bank and then walked back to her home along the same route. the bus traveled at an average speed of 40 km/h and she walked at an average speed of 5 km/h. to determine the time, x, that it took talia to walk home, she used the equation 40(0.9 – x) = 5x. the time of trip 2 is hours. the distance of trip 1 is km.