Which of the following expressions represents a function?

a. x2 y2 = 9

b. { (4, 2), (4, - 2), (9, 3), (9, - 3) }

c. x = 4

d. 2x y = 5

Nvm i have a new question i need to know if the answer is correct 4x (6) + y=20 i got y=20-24x do i have to subtract 20 from 24x to get the answer or is 24x the answer or is it - 24x?

The number of students in a chess club decreased from 23 to 17. What is the percent decrease? Round your answer to the nearest percent.

Scientific notation of 0.0008

What is the unit rate for 99/12

Convert 17 km to meters

Fir a walk-a-thon a sponsor to give a flat tree of 5$ plus 2$ for every mile m you walk

Match the y-coordinate with the given x-coordinate for the equation y=log2x

The cost of the sail boat depreciates over time exponentially if the cost of the sail boat was 225,000 in 2020 and depreciates at a rate of 2.5% annually how much is the sail boat worth in 2028

Factor the expression gcf 12w-18

Suppose carpet for a 6 ft by 14 ft room costs $400. find the cost to carpet a room 18 ft by 42 ft.