I need help understanding my math homework. I don’t get it. PLEASE HELP!

Question

Which situation would most likely be represented with a linear function?

A) the speed of a car in race

B) the speed of a car on highway

C) the speed of a car driving around town

D) the speed of a car driving across the country

Find f(-2). f(x)=9x²-5x+2

A) 14

B) 18

C) 28

D) 48

A one-way flight from Dallas to Atlanta is “150x - 100” miles. Find a single expression that represents the distance for a round trip flight.

A) 300x

B) 300x + 200

C) 300x - 200

D) 300x - 400

Answer 1

Which situation would most likely be represented with a linear function?

A) the speed of a car in race

B) the speed of a car on highway

C) the speed of a car driving around town

D) the speed of a car driving across the country

solution:

B) the speed of a car on highway

Find f(-2). f(x)=9x²-5x+2

A) 14

B) 18

C) 28

D) 48

solution:

f(-2)=9(-2)² -5(-2)+2

=9(4)+10+2

=48

A one-way flight from Dallas to Atlanta is “150x - 100” miles. Find a single expression that represents the distance for a round trip flight.

A) 300x

B) 300x + 200

C) 300x - 200

D) 300x - 400

solution

2(150x-100)= 300x -200