If f(x) = -5x + 11 and f(n) = 21, what is the value of n?

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?

How can a bar model be used to solve for the unknown variable in the equation below? show your work model and then solve. 2/5n-7=9 1/4

Arrange the parabolas represented by the equations in increasing order with respect to the y-values of their directrixes. y = -x2 + 3x + 8 y = 2x2 + 15x + 18 y = x2 + 13x + 5 y = -2x2 + 4x + 8