Which direction does the graph of f(x) = −2x^2 + x − 4 open? up down left right

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

The parabola opens: y=√x-4 (principal square root) up down right left

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?