What’s the surface area of a prism if length is 5.1 and width is 3.5 and height is 2.2

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?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?