Which choice is the explicit formula for the following geometric sequence?

0.5, -0.1, 0.02, -0.004, 0.0008,

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

If value of cos330° is √3/2 then find tan165°.

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter