What are the coordinates of A(8,-1) after a rotation of 180° about the origin

Find the indicated value, where g(t) = t^2-t and f(x)= 1+x a. -2 b. 0 c. 2 d. 8

Solve the following inequalities and show the solution on a number line. 2x+3< 3(4x+5)

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