The Purplemath Forums

today we were given this equation in our college entrance exam review class: http://i29.photobucket.com/albums/c256/chikage3/uh/wah.png I was too busy trying to solve it on my own that I didn't get to listen to the explanation, but i saw on the board that the answer is: http://i29.photobucket.com/al...

Hello, everyone. I was hoping you guys could help me out. I'm about to take this huge college entrance exam in two months and I bought this reviewer at a bookstore - the problem, however, is that the reviewer I bought only posts the ANSWERS to the questions without explanations. How do you solve com...

thanks!

In how many ways can a comittee of five be chosen out of 15 people, 7 of which are males and 8 of which are females, if one male and one female are to be included in each selection? In how many ways can you choose the one required male? In how many ways can you choose the one required female? In ho...

On what basis are you finding the number of ways that they could be picked in order? Isn't this a combination, so the order doesn't matter? :confused: oh. right. I forgot about that. *embarrased* well anyway, would it be okay to ask for a detailed explanation as to how to solve these kinds of combi...

i'm stuck. "Rose made two investments totaling $25,000. On one investment she made 12% profit, but on the other she took an 18% loss. If her net loss was $1200, how much was the investment that gained a 12% profit?" (the answer should be $11,000 ) Her net loss was $1200 - does that mean he...

this word problem looks really easy, but for some reason I CAN'T SOLVE IT (although I do know the right answer since it came from a college entrance test review book): Car A leads Car B by 50 km with velocities 10 kph and 20 kph respectively. If they are headed in the same direction, after how many ...

(sin A + cos A) (tan A + cot A) = sec A + csc A

any help would be great!