Guys
anyway can anyone explain how to do 12. (a
just letter a

x = 3 seconds

Step-by-step explanation:

The time (x) at which the function reaches its maximum can be determined in couple of ways. If you know calculus, you differentiate the quadratic, set to 0 and solve: . If you do not yet know how to do that, you can just apply the following argument:

The expression will be non-positive for any x. The largest it can be is 0. So the entire function can be at most 23, or less. It is 23 only when and that happens exactly for x=3 (seconds).

As a third option, you can also use a formula for the maximum point of a parabola, but the formula is non-intuitive so I prefer to skip that.

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

answer

the correct answer is

explanation

the given function is

the excluded values are obtained by solving:

we factor to obtain:

the excluded values are