.) Points (1, -7)(-5, 0) ) Points (6, 9) (-4,-2)
Points (8,-6) (6,8)
Points (4, 1) (-6, 4)
Points (6, -7) (8,5)
Points (8, 7) (-6, 4)
Points (5,-6) (-4, 2)
Points (-1: 6) (8,6)
Points (2.7) (0,7)
Points (2.-7) (-9.9)

How to solve all these ?

How many solutions does the nonlinear system of equations graphed bellow have?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.