Jack and Jim are playing tug of war. The ribbon at point B is tied at the midpoint of the rope. The length of (AB) can be represented by 1/3 x+15, and the length of (BC) can be represented
By 2(x-5). What is the length of (AB)?

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?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.