Answer:
183 meters
Step-by-step explanation:
A 1:750 scale model means that each cm on the model corresponds to 750 cm of the actual Sydney Opera House. If the model is 24.4 centimeters long, the actual Opera House has a length of:

The actual length of the Sydney Opera House is 183 m.
Answer:
The minimum value of C is 20
Step-by-step explanation:
we have
----> constraint 1
----> constraint 2
----> constraint 3
----> constraint 4
using a graphing tool
The solution is the shaded area
see the attached figure
To find the minimum value of C evaluate the vertices (9,2) and (12,0) of the solution area in the objective function 
so
For x=9, y=2 ---> 
For x=12, y=0 ---> 
therefore
The minimum value of C is 20
Y = -9x - 10
The dolphin is diving 9 feet per second so the rate of change is -9.
It's also 10 feet below sea level which makes the y-intercept -10
Hope this helped!
-1*x^2= -1
-1*(1)^2
-1*1= -1