What is the product of -2 1/2 and -3 1/2

If rt is greater than ba, which statement must be true ?

Two cities a and b are 1400km apart and lie on the same n-s line. the latitude of city a is 23 degrees. what is the latitude of city b. the radius of the earth is approximately 6400km.

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.