Mary, who is 4 feet tall, casts a shadow 2 feet long. at the same time, a pole casts a shadow 3 feet long. how tall is the pole?

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Find the area of the regular hexagon if a side is 20 cm.

How do you find the circumfrance of a circle?