A baseball is thrown upward at an initial speed of 9.5 m/s. The approximate height of the ball, h meters, after t seconds, is given by the equation h= -4.9t+9.5t+1. At the same time, a golf ball is hit upward at an initial speed of 12 m/s. The approximate height of the ball, h meters, after t second, is given by the equation h=-4.9t^2+12t. When are both balls at the same height? Round to the nearest tenth.

Asmall (but heavy) particle placed in a glass of water will follow a zigzag motion because the particle will bounce off of the water molecules it meets. this is called brownian motion. a physicist simulates this on a computer, by varying the distance a particle can travel (called the mean free length), on average, before it collides with a water molecule and assigning the change in motion to be one of 8 directions, each with a similar probability. by running the simulated particle (with the same mean free length) many times she determines that it should take 15 seconds, on average, for the particle to fall to the bottom, with a standard deviation of 1.5 seconds. next she lets a real particle fall through a glass of water and finds that it took 18 seconds. what does she conclude, and why?

Find the quotient. 50a2 – 98b2 -5a +7b

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes