Choose the equivalent system of linear equations that will produce the same solution as the one given below.

4x − 2y = 6
2x + y = 5

a: −4x − 2y = 10
−4y = 4
b: −4x − 5y = −1
−7y = 5
c: 3x + 2y = 6
7x = 12
d: 4x + 2y = 10
8x = 16

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?