What is the value of 5k2 – 6 when k = 9?

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.