What is the discriminant of f(x)=-x^2-x+5?

a.-21
b.0
c.2
d.21

Which mathematical statements are true? 1) if 3 is an odd number, then 3 times 3 is an even number. 2) if 6 is less than 7, then 4 is greater than 7. 3) six is divisible by 3, and 10 is a multiple of 2. 4) the average of the data is greater than the largest value in the data, or it’s less than the largest value in the data. 5) the slope of a linear graph is its rate of change, and the graph’s y-intercept is the initial value. 6) if an equilateral triangle has equal angles, then all its angles will measure 45°.

Which of the following is the shape of a cross section of the figure shown below

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2