the speed, s, in metres per secondm of sound in dry air can be described by the function s=331.3sqrt(1+T/273.15) T is degrees in celcius

a) determine the domain and range of the function

what i PUT:

domain: {x|x>=-1,xer}

range: {y|y>=0, yer}

IT WAS WRONG

geogebra said the x-int is 273.15 but i thought it would be -1 because it says +1 on the function and the range is apparently wrong too, anyways would be appreciated if someone helped.

b) what is the meaninig of the x-intercept in this context?

2. the manufacturer of a new GLOBAL POSITION SATELLITE system wants to predict the consumer interest in its new device. the company uses the function I(w)= -3sqrt(-w-1) +15 (square root is done after -1, +15 is alone) to model number, I, in thousandas, of pre-orders for the GPS as a function of the number ,w ,of weeks before the GPS release date.

a) what are the domain and range and what do they mean in this situation?

i put:

domain: {x|x<=1,xer}

range: {y|y<=15,xer}

can u tell me if my answer is right and what do they mean in the situation

b) identify the transformations represented by the function compared to y=sqrt(w)

c)determine the number of pre-orders the manufacturer can expect to have 10 weeks before the release date?

3. consider the function f(x)=2(x-1)^2-3

a)determine square root of the function

i put: g(x)=sqrt(2(x-1)^2-3 <--tell me if the square root is right

and they told me to graph both equations and i cant seem to find the x-intercepts for the first function, if anyone can help.

C)describe the relationship between the domain and range of f(x) and domain and range of g(x)

(i know they seem alot, but i left most stuff out and the stuff i understood i left out. these questions are all too hard for me to do, if anyone can help, its test preparation and not cheating for homework, thnx if you help)