If sin theta=2/3 and tan theta < 0, what what is the value of cos theta?

A sqrt 5 over 2
B -sqrt5
C sqrt5 over 3
D -sqrt5 over 3

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?