Select all the correct answers. Which vectors are unit vectors? U=(-1/3 sqrt(7/2),1/3sqrt(13/2))
U=(1/sqrt(3),-sqrt(2/3))
U=(1/2sqrt(5/3),-1/2sqrt(7/3))
U=(3/sqrt(7),-2/sqrt(7))
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Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

Draw a scaled copy of the circle using a scale factor of 2

Annabelle's homework is 75% it took her three hours how long should she estimate it will take her to complete her homework.