Our parent function is f(x)=x^2. A vertical stretch by a factor of k means that every point (x,f(x)), has been transformed into (x,kf(x)). Alex is clearly incorrect as our parent function has been transformed to (x,9f(x)), not (x,3f(x)). A horizontal stretch(or compression) by a factor of k means our function has been transformed to (x/k,f(x)). Here, Marta is saying our function should look like (3x,f(x)). This can also be achieved by plugging 3x into the parent function, which would give us f(3x)=(3x)^2, so it seems that Marta is the correct one.
Answer:
slope intercept form is y=x+1
Answer:
Growth
Step-by-step explanation:
Given

Required
Growth or decay
The general form is:

Such that:

For b, we have the following conditions:
----- Growth
--- Decay
---- None
Compare
to 

<em>Because 2.5 > 1, then the first condition applies (growth)</em>
Answer:
None or 1499 + 287 I assume
Answer:
the time Ari spent to walk is

the time Beth spent to walk is

the time Cathy spent to walk is 1h21' = 1.35(h)
so the time Ari spent > Cathy > Beth
=> list: Beth, Cathy, Ari