Write and solve an equation to determine the value of x in the figure. a. 3x 84; 252 b. 3x 84; 28 c. 3x 84; 84 d. 3x 84; 81

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?