The mean is 100 and the standard deviation is 15. What is the percentile rank for each of the following scores? 1) 130
2) 145
3) 85
4) 70

Find the solution of system of equation y= x-4 y=4x+2

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.

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?