given what you know about the bohr shift, what is the difference in o2 saturation of hemoglobin in the lungs versus hemoglobin in exercising tissues, as represented on this graph? keep in mind that the ph of blood in the lungs is not the same as the ph of blood in exercising tissues.

a compound light microscope is used to magnify objects in steps.  

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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.