How do I decide whether a relation is a function or not?

Round 3,989.23655 to the nearest thousandth.

Naomi has earned $54 mowing lawns in the past two days she worked 2 1/2 hours yesterday And 4 1/4 hours today if Naomi is pay the same amount for every hour she works how much does she earn per hour to mow lawns

23. Solve: 14-4y_<66 A) Y_>-17 B) Y>-13 C) Y_>-13 D) Y>-17 Note: _ mean less than or equal to and greater than or equal to. (I didn't have a way to type that out.)

maureen purchased a watch for a sale price of $24. the price was 20% off its original price. which expression computes the original price of the watch? (answer choices A. $24 x 0.20 B. $24 x (1 - 0.20) C. $24 : (1 - 0.20) D. $24 : 0.20)

Sun Yi estimated 270 + 146 and got 320 is her estimate reasonable explain

Jade is making a square birthday card and she's going to put a ribbon borders on each of the 4 equal sides piece of ribbon that is 33 inches long do you have all of the ribbon how many inches of ribbon conget put on all equals side

Suppose that textbook weights are normally distributed. You measure 28 textbooks' weights, and find they have a mean weight of 76 ounces. Assume the population standard deviation is 12.3 ounces.

ABC Bookstore rents a storage space that is 75 ft x 50 ft and 15 ft high. It is charged $2.50 per square foot. How much does ABC Bookstore spend on storage space? O A. $140,625 O B. $9375 O C. $2500 O D. $3750

31/9 as a mixed number

Find 4x when 3x equals 3