Part A: Explain why x = 6 makes 4x - 55 19 true but not 4x - 5 < 19. Part B: What value from the set {4,5,6,7,8} makes the equation 4x + 3 = 23 true? Show your work

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

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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?