What is the circumference of the following circle?

Write 5 numbers that round to 740 when rounded to the nearest 10

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?