8. A small rocket was launched from a platform. Its height is described by the relation h=-0.5(1 - 62)? + 2000, where h is the height of the ball in metres and t is the time in seconds.
a)
What is the maximum height that the rocket reaches?
b)
How long did it take for the rocket to reach the maximum height?
c)
How high was the launch platform?

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.