What is 5 x 3/4 and please give me your simplest answer

Describe all the numbers that when rounded to the nearest thousand are 645,000

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

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined