If the points (3,5), (4,2) and (5,k) lie on a straight line, the value of k is?

Amonument at a park is in the shape of a right square pyramid. a diagram of the pyramid and its net are shown. what is the surface area of the monument? enter the answer in the box. m²

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

The size of a certain cell is 2.5*10^-9m. another cell is 1.5*10^3 times larger. how large is the larger cell in scientific notation?