I don't have a big brain

Find the quotient.
77/-11 =

Solve for the equation. 4x - 13 = 2x + 9

Acone with radius 5 cm and height 12 cm how many cm ?

The word population in 2013 was about 7.125 billion. in 2003, it was about 6.357billion. which number represents the increase in the world population between 2003 and 2013? a; 0.0768x10/7 b; 0.768x 10/8 c; 7.68x 10/9 d; 7.68x 10/8