3. Describe the pathway that depolarization takes as it travels through the heart.

Depolarisation occurs when the nerve cells reverses their charges.

Explanation:Depolarization occurs in the four chambers of the heart.Both atria first and both ventricles.The sinoatria (SA) node on the wall of the right atrium initiates Depolarization in the right and left atria,causing contraction,which is symbolized by the P wave on an electrocardiogram.

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answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.