A researcher has noted that the repair times of a sample of 15 new lawn mowers has a standard deviation of 4 minutes. A 95% confidence interval estimate for the variance of service times for all its new lawn mowers is: a) 8.58 to 39.79
b) 1.64 to 1.96
c) 4 to 16
d) 4 to 15

Let f(x)=2x and g(x)=2x. graph the functions on the same coordinate plane. what are the solutions to the equation f(x)=g(x) ?me asap

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0