SRL Archive - Mathematics

Hello everyone. I'm just studying for a placement test at my community college and part of the math placement test is operations with positive fractions.

Here are some Practice ?'s

Express 3x3x3x5x5 using exponents

and

write the rate of 400 miles in 8 hours in simplest form?

many of you might think I'm dumb or what ever, lol i was never good at math but CompSci needs me to be so i figured I'd ask one smart community for the help :) thanks to who ever will help!

(3^3)*(5^2) or 675^1 if you want to be a smartass

400/8 = 50 mph

3 * 3 * 3 * 5 * 5 using exponents: (3^3) * (5^2)

Three cubed (27) times five squared (25) equals 675.

Second one is a little weird, depends on the form they want it in. I assume you could do a ratio seeing as they use the term "rate," that'd be 400:8 or 50:1 reduced.
Or you could put it in miles per hour (50 mph)

While getting the answers might be fine and dandy, you will be in very real trouble if you go in to CS and don't understand the underlying concepts here. A good test to see if you get them is to see if you can use the concept from the first problem to solve the second.

first of all, thank you guys for helping lol. Okay J_R it's not that i don't understand, its just i haven't really done math in a while haha. But i do understand, if i don't understand this, how can i get into calc or liner algebra.