Determine whether the a value is positive or negative provide an appropriate reason is it
number one the a value is positive because the graph is of a parabola that opens up.
Number two The a value is negative because the X intercepts are negative number 3 the a value is negative because the graph of a parabola that opens down Or number 4 the availability is negative because the water intercept is negative
Number one is correct. The "a" value in a quadratic equation determines the shape of the parabola. If the "a" value is positive, the parabola opens up. If the "a" value is negative, the parabola opens down. Therefore, if the graph is of a parabola that opens up, the "a" value is positive.
Number two is incorrect. The X-intercepts of a parabola do not determine the sign of the "a" value. The X-intercepts only tell us the values of x when the y-coordinate is equal to zero.
Number three is correct. As explained in number one, if the graph is of a parabola that opens down, the "a" value is negative.
Number four is incorrect. The concept of "water intercepts" is unclear and does not provide a valid reason for determining the sign of the "a" value.