If B is the midpoint of AC, and AC=8x-20, find BC.

Step-by-step explanation:

Start with:

Since is the midpoint, we also know that:

Knowing this, we can use a system of equations and substitute for in the equation we started with:

Let's identify our values:

Substitute:

Combine like terms:

Add to both sides of the equation:

Subtract from both sides of the equation:

Divide by the coefficient of , which is

Substitute into

Solve:

Remember that , thus:

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.