Which description best explains the domain of (gºf)(x)?
the elements in the domain of f(x) for which g(f(x)) is defined
the elements in the domain of f(x) for which g({(x)) is not zero
the elements in the domain of g(x) for which g{{(x)) is defined
the elements in the domain of g(x) for which tr(x)) is not zero
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A. The elements in the domain of f(x) for which g(f(x)) is defined

I just took the test myself. (gºf)(x) can be rewritten as g(f(x)) and the interior function, which is f(x) in this case, is the domain, where x is defined.

SI=(P*R*T)/100

P=2000

R=1.5

T=6

SI=(2000*1.5*6)/100

=(2000*9)/100

=180

Neil will earn interest of 180

The answer is in the image 

The answer is in the image 

The solution is in the following image

y=2x+15

where y=Value of coin

x=Age in years

Value of coin after 19 years=2*19+15

=$53

Therefore, Value after 19 years=$53

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

    =4300/3.3

    =1303.03kg

Approximately it is aqual to 1300kg

The solution is given in the image below

Here,

tip=18%of $32

tip=(18/100)*32

=0.18*32

=$5.76

Total payment=32+5.76=$37.76

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.