Prove the identity (sina-cosatanb) / (cosa+sinatanb) = tan (a+b)

What is the product of yx^2 and (6y^2x-yx)

Your cell phone plan costs $39.99 per month plus $0.14 for each text message you send or receive. You have at most $43 to spend on your cell phone bill. What is the maximum number of text messages that you can send or receive next month?

J + 150 x 50 is what type of expression

There are 16 boys and 12 girls in the spanish club. four more boys joined the spanish club if ratio of boys to girls did not change, how many girls joined the spanish club?

Kelly drinks 0.5 liters of coffee and 0.3 liters of yogurt drink at breakfast. How much did she drink in total in milliliters?

Show that the maximum rate of change, with respect to radius, of the volume of a deflating balloon is four times the sphere's initial great circle circumference

A bag contains 17 balls numbered 1 through 17. what is the probability of selecting a ball that has an even number when one ball is drawn from the bag?

The height of a trapezoid is 2 feet. One of the bases is three times the height, and the other base is four times the height. Find the area of the trapezoid?

Solve the equation P=k x t / V for the letter k

What's a smart way to save money on prescription drugs