Is {(3,1), (5,3), (7,5), (5,-1), (-3,3), (-7,2)} a function

No. It is not a function

Step-by-step explanation:

A relation is said to be a function between sets when every element of the first set have exactly one image in the second set.

Since, the element of first set i.e. 5 have two images 3 and -1 in the second set, it is not a function.

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18. g

20. h 30 degree turn.

21. d 90 degree angles

and also 19 is a. a sphere not a cirlcle

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i think it's either c or d

step-by-step explanation: the entire question is extremely odd. 04 obviously refers to the interest rate. honestly i will say the answer is c. because the (2 x 12) part would mean it's compounded semiannually. i'll say choose c.