Choose the expression that represents a quadratic expression. 9x − 2 5x2 + 9x − 1 −2x3 + 8x2 − 7x + 1 x4 − 12x3 + 8x2 − 7x + 1

Step-by-step explanation:

A quadratic expresion is of the form

where

The give options are:

From the given options, the only expression which is quadratic is

where a =5, b=9 and c=-1

Therefore the correct choice is the second option.

$9.89

step-by-step explanation:

9.90 = p x .06 x .25 (3/12 changed to a decimal)

9.90 = p x 0.015

9.90 - 0.015 = p

9.89 = p

step-by-step explanation: