Select all that apply. Which set of ordered pairs represent a function?

a. {(-7,0), (9,-1),(-4,3), (-4,-2)}
b. {(-1,3), (-10,-5),(-1,-6),(-1, -2)}
c. {(-9,-5), (6,-9), (6, -10), (6, 7)}
d. {(3,3), (3, -1),(3,5), (3,7)}
e. None of the above

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

Which matrix multiplication is possible?

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?