Amir stands on a balcony and throws a ball to his dog, who is at ground level. The ball's height (in meters above the ground), xxx seconds after Amir threw it, is modeled by h(x)=-(x+1)(x-7)h(x)=−(x+1)(x−7)h, (, x, ), equals, minus, (, x, plus, 1, ), (, x, minus, 7, )How many seconds after being thrown will the ball reach its maximum height?

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.

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