Urgent which equation can be used to find the measure of angle bac?

tan−1 = x-1 5/12=x
tan−1 = x-1 12/5=x
cos−1 = x-1 12/13=x
cos−1 = x-1 13/12=x

Acircle has a circumference of 28.36 units what is the diameter of the circle

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?

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost