COLLEGE BOARD Test 9 Math Section 3 #13

COLLEGE BOARD Test 9 Math Section 3 #13

Could you suggest a shortcut or fast way to solve this? All the answers are written in vertex form, so we can quickly eliminate two of them, as the coordinates of the vertex, as indicated by the graph provided, must be (3,1). That leaves choices A and C. Is there a quick way to solve from there without plugging in values from the graph?

The call signs of radio and television stations in the United States generally begin with the letter W east of the Mississippi River and the letter K west of the Mississippi…

The call signs of radio and television stations in the United States generally begin with the letter W east of the Mississippi River and the letter K west of the Mississippi. Repetition of letters is allowed. How many different call signs are possible if each station uses a W or K followed by 3 letters?

Renting video games from The Video Vendor costs $6 per game with no annual membership fee…

Renting video games from The Video Vendor costs
$6 per game with no annual membership fee. Renting
video games from The Game Garage costs $3 per
game, but a customer must pay an additional $60 for
an annual membership. If n represents the number of
video games a customer rents in a year, which of the
following gives all values of n for which it costs less
to rent from The Game Garage than from The Video
Vendor?

at 7am a sewage treatment tank contains 3000000 gallons of water…

at 7am a sewage treatment tank contains 3000000 gallons of water. starting at 7am, x gallons per minute flow into the tank, and y gallons per minute flow out of the tank. no water enters or leaves the tank otherwise. which of the following functions f models the number of gallons of water in the sewage treatment plant at 8am?