If the number in the numerator of a unit rate is 1 what does this indicate about the equivalent unit rates

Which of the following circles have their centers in the third quadrant? check all that apply.

The life (in hours) of a magnetic resonance imagining machine (mri) is modeled by a weibull distribution with parameters β = 2 and δ = 370 hours. (a) determine the mean life of the mri. (round your answer to 2 decimal ) determine the variance of the life of the mri. (round your answer to 1 decimal ) what is the probability that the mri fails before 250 hours? (round your answer to 4 decimal places.)

What is the solution to this system of linear equations? x + y = 4 x - y = 6 (4,6) (6,4) (5, -1) (-1,5)