URGENT IN NEED OF HELP ASAP Find an angle with sin>0 & cos<0

Find an angle with sec<0 & tan>0

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?