A researcher in physiology has decided that a good mathematical model for the number of impulses fired after a nerve has been stimulated is given by y = – x2 + 30x- 40, where y is the number of
responses per millisecond and x is the number of milliseconds since the nerve was stimulated.
(a) When will the maximum firing rate be reached?
(b) What is the maximum firing rate?

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step-by-step explanation:

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system

b. hannah is playing with her cousin at

i dont know the answer but here's a picture of a dog