Question

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Answer 1

3 variables tends to represent a surface ... which are pretty hard to sketch in general

Answer 2

can you work it out and i will draw the sketch

Answer 3

the domains will be all combinations of permitable values ... recall the basics: no dividing by zero, no logs of 0 and below, no even radical that are negative ... some trig function go weird too

Answer 4

ok,

Answer 5

1.1.1 for example

as long as the under part is not negative, its good; sooo

1-x^2-y^2 >= 0 is the domain

Answer 6

1.1.3 ... we have radicals again, so we need to define its bad parts

x^2-4 >= 0 and 4-y^2 >= 0

Answer 7

and how do i know about the infinite, _ or +

Answer 8

the area of the domian will determine that; youd have to sketch the region .. i thought it was saying to sketch the functions at first :) these are just inequality areas

Answer 9

ok,

Answer 10

x^2-4 >= 0 and 4-y^2 >= 0