Lim ln(tan x) as tends to pi/2 from the left

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

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