Simplify the following expression into the form a + bi, where a and b are rational numbers. (4-i) (-3+7i) - 7i(8+2i) .

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%

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2

What is the expression in factored form? -x^2 + 3x + 28 a. (x-7)(x-4) b. -(x-7)(x+4) c. (x+4)(x+7) d. -(x-4)(x+7)