Select all that apply. Which of the following are practical uses for elliptical equations?

Calculating steam boiler heads
Calculating the arch of a domed building
Calculating engine hydraulic line shape
Calculating planetary orbits

Calculating engine hydraulic line shape

Step-by-step explanation:

Many real-world situations can be represented by ellipses, including orbits of planets, satellites, moons and comets, and shapes of boat keels, rudders, and some airplane wings. A medical device called a lithotripter uses elliptical reflectors to break up kidney stones by generating sound waves.

- (2, -7)

- lines r and s and lines t and u must be parallel

b. b < 1 might be the correct answer