Jack threw a rock into the lake and is represented by the equation f(x)=-3x^2-6x+21, where f(x) is the height in feet and x, is the time in seconds. find the h, of the vertex (h, k) and find the zeros. what does each mean in the context of the question?

41/2 - 1 1/3 what is the answer as a fraction?

Which is the standard form for this number? (4 x 1 100 ) + (8 x 1 1,000 ) + ( 3 x 1 100,000 ) ? a) 0.004803 b) 0.04803 c) 0.0483 d) 0.483

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.