Shiloh is 7 years older than courtney. shiloh's age is 13 years less than two times courtney's age. the system below models the relationship between shiloh's age (s) and courtney's age
c. :
s = c + 7
s = 2c – 13
which of the following methods is correct to find shiloh's and courtney's age? (4 points)
solve s + 7 = 2s – 13 to find the value of s.
solve c + 7 = 2c – 13 to find the value of
c.
write the points where the graphs of the equations intersect the x0axis.
write the points where the graphs of the equations intersect the y0axis.

Aregression was run to determine if there is a relationship between hours of tv watched per day (x) and number of situps a person can do (y). the results of the regression were: y=ax+b a=-0.662 b=30.418 r2=0.703921 r=-0.839

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The weibull distribution is widely used in statistical problems relating to aging of solid insulating materials subjected to aging and stress. use this distribution as a model for time (in hours) to failure of solid insulating specimens subjected to ac voltage. the values of the parameters depend on the voltage and temperature; suppose α = 2.5 and β = 190. (a) what is the probability that a specimen's lifetime is at most 250? less than 250? more than 300? (round your answers to four decimal places.) at most 250 less than 250 more than 300 (b) what is the probability that a specimen's lifetime is between 100 and 250? (round your answer to four decimal places.) (c) what value is such that exactly 50% of all specimens have lifetimes exceeding that value? (round your answer to three decimal places.) hr