A scientist is investigating the effects of salinity on fish development. He places fertilized fish eggs in an aquarium that contains low salinity and observes their development. What factor would improve experimental design the most? (3 points) Group of answer choices

Place the fish eggs in the open ocean because that is the natural habitat

Include another aquarium that has normal salinity to compare to the low salinity aquarium

Include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt

Grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos

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.