The effectiveness of a television commercial depends on how many times a view watches it. After some experiments, an advertising agency found that if the effectiveness E is measured on a scale of 0 to 10, then

E(n) = 2/3n - 1/87n^2

where n i sthe number of times a viewer watches a given commercial. For a commercial to have maximum effectiveness, how many times should a viewer watch it?

The data in the table represent the height of an object over time. which model best represents the data? height of an object time (seconds) height (feet) 05 1 50 2 70 3 48 quadratic, because the height of the object increases or decreases with a multiplicative rate of change quadratic, because the height increases and then decreases exponential, because the height of the object increases or decreases with a multiplicative rate of change exponential, because the height increases and then decreases

Consider 6x2 + 6x + 1. which term immediately tells you that this expression is not a perfect square trinomial? justify your answer

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?