Simplify the following polynomial expression? (5x^4-9x^3+7x-1)+(-8x^4+4x^2-3x++5x -1)(2x-7)

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

2.5 milligrams is equivalent to how many grams