How do I know if a pair is a function or not?

Tristan uses 7 stsrs and 9 diamonds to make a design. write two ratios that are equivalent to 7/9

Zoey goes to a store an buys an item that costs x dollars. She has a coupon for 15% off, and then a 9% tax is added to the discounted price. Write an expression in terms of x that represents the total amount that Zoey paid at the register.

How many numbers are inbetween 20 and 45?

How many ounces are in 7 pounds

Trinh has $14.44 in her school lunch account. She spends $7.75 on lunches and deposits $6.50. What is her new balance? A) $ 28.69 B) $13.81 C) $13.19 D) $0.19

The volume of a tissue box is 288in3. If the box has a width of 6 inches and it is 4 inches high, how long is the box?

2.5 (x-7) + 0.5=12.5. "I bought a cookbook for $7. If I had $2.5 more, I could have bought another book for $12.50".

If you took a true " if then " statement inserted a not in each clause, and reversed the clauses, the new statement would also be true

Find the values of l and m that make each equation true (7+m) + (4l-10) i=3 - 6i

Is 0.2222 ... a rational number