Answer:
1. her elevation at noon was 3 meters
2. (-2, 7)
3. (1, 0)
Step-by-step explanation:
1. when x = 0, it is noon, y = 3 when x is 7
2. when x = -2 it is 10 am because when x is 0, it is noon, or 12 pm, her elevation is 7 meters above sea level
3. when x is 1, it is 1 pm, and her elevation is 0 meters
Answer:

Step-by-step explanation:
The diagonals of a rectangle always bisect each other. Therefore, we can set
:

Answer:
Step-by-step explanation:
Direct variation problems can easily be solved with proportions, namely:
and cross multiply to get
2y = 20 so
y = 10
Answer:
Step-by-step explanation:
Given that a small business assumes that the demand function for one of its new products can be modeled by

Substitute the given values for p and x to get two equations in c and k

Dividing on by other we get

Substitute value of k in any one equation

b) Revenue of the product is demand and price
i.e. R(x) = p*x = 
Use Calculus derivative test to find max Revenue
R'(x) =
EquateI derivative to 0
1-0.000589x =0
x = 1698.037
When x = 1698 and p = 16.56469