7 Select the correct answer from each drop-down menu.
Complete the sentences about a method of heat transfer.
The Sun transfers heat to Earth through
This method of heat transfer is evidence that
v is not necessary for heat to move from place to place.
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The Sun transfers heat to Earth through electromagnetic radiation

This method of heat transfer is evidence that Heat can be transmitted through empty space by thermal radiation often called infrared radiation.

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.