If we want to find the height of an object like a flagpole, we can use (fill in the blank) triangles. In the graphic above, triangle ABE is similar to triangle ACD. In the graphic line segment DC is the height of the (fill in the blank). Using the length of BE (your height), AB (your shadow), and AC (shadow of flagpole), we can use a proportion to determine the height of the (fill in the blank). I really dont understand this question

Joel wants to buy a new tablet computer fram a store having a 20% off sale on all tablets. the tablet he wants has an original cost of $190. he also wants to make sure he has enough money to pay the 5% sales tax. part one joel uses the incorect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of $144.40. describe his error and write the correct expression part two how much will joel pay for the tablet show your work if you answer this question correctly you will receive a prize of 99 points good luck