Determine which system below will produce infinitely many solutions. (2 points) 1) -4x + 6y = 20        4x - 3y = -2 2) -2x + 4y = 18          4x - 8y = -36 3) 3x - 2y = 5              -6x - 4y = -10 4) 5x - 3y = 12            15x - 9y = 24

1. there are 25 students who started computer programming in elementary school and 25 students who started computer programming in middle school. the first group had a mean final project grade of 95% and the second group had a mean final project grade of 92%. the line plot shows the differences after 10 rerandomizations. determine whether the difference in the means of the two groups is significant based on the line plot. explain your answer.

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Which expression shows the sum of the polynomials with like terms grouped together