4. simplify. a) 5(2x + 3y) - 4(3x - 5y) b) x - 2(x + 3y) - (2x + 3y) - 4(x + y) c) 3(a + 2b - 2) - 2(2a - 5b - 1)

The contents of 3838 cans of coke have a mean of x¯¯¯=12.15x¯=12.15. assume the contents of cans of coke have a normal distribution with standard deviation of σ=0.12.σ=0.12. find the value of the test statistic zz for the claim that the population mean is μ=12.μ=12.

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10