Subtract: 66 feet 3 inches - 9 inches

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

In the diagram, a building cast a 35-ft shadow and a flagpole casts an 8-ft shadow. if the the flagpole is 18 ft tall, how tall is the building? round the the nearest tenth.