When Lakeesha solved the equation from problem 6-54, she reasoned this way: "Since groups of equals 3 groups of , then I know that each group of must equal ."

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?

In the diagram, be and ad pass throughthe center of circle o, and the area ofsector aoc is 47.45 square units. what isthe area of sector boc? use the value =3.14, and round your answer to two decimalplaces.22.33 square units25.12 square units