Find the first, fourth, and tenth terms of the arithmetic sequence described by the given rule. a(n) = -6 + (1 - 1)(1)

7x+8y=-18, 4x-9y=-3 solve the system of equations

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

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document