HELP!! :(
The area (A) of a circle is a function of its radius (r) and is given by the function A = f(r) = πr2. What is the domain of this function?

a: all positive real numbers
b: all real numbers
c: all positive real numbers including 0
d: all real numbers excluding fractions

Question

HELP!! :(
The area (A) of a circle is a function of its radius (r) and is given by the function A = f(r) = πr2. What is the domain of this function?

a: all positive real numbers
b: all real numbers
c: all positive real numbers including 0
d: all real numbers excluding fractions

anonymous · Answer

@xapproachesinfinity

anonymous · Answer

@jim_thompson5910

jim_thompson5910 · Answer

the domain is the set of allowed values to plug into r

jim_thompson5910 · Answer

so what kinds of numbers can you replace r with?

anonymous · Answer

probably with b: all real numbers i guess @jim_thompson5910

jim_thompson5910 · Answer

can you replace r with a negative number?

jim_thompson5910 · Answer

does it make sense to have a negative radius though?

anonymous · Answer

no it doesnt is not possible @jim_thompson5910 so it would be a right?

jim_thompson5910 · Answer

can 0 be allowed? or no?

anonymous · Answer

im not sure? can it be allowed?....i think if 0 is possible wouldn look like a circle but a thot

jim_thompson5910 · Answer

it is possible because if r = 0, then you have a circle with 0 area...aka a single point

anonymous · Answer

ohh so real numbers including 0 are the domain of that funtion?

jim_thompson5910 · Answer

yes

jim_thompson5910 · Answer

positive including 0

jim_thompson5910 · Answer

not real

jim_thompson5910 · Answer

well positive real including 0

anonymous · Answer

yeah thats what i meant to all possitive real # and 0..but anyways Thank u so much :) @jim_thompson5910

jim_thompson5910 · Answer

you're welcome