Help please! Medal and fan! :)

Question

anonymous · Answer

attachment

anonymous · Answer

attachment

anonymous · Answer

attachment

anonymous · Answer

attachment

anonymous · Answer

For the first one, look at when $$4x-3=0$$
and $$2x-1=0$$
only one answer has those two values...

anonymous · Answer

I was thinking it was C... Is that wrong?

anonymous · Answer

Nope...C is exactly right :)

anonymous · Answer

Oh, okay. Thank you. :)

anonymous · Answer

For the second one, they *want* you to set the quadratic equal to 192 and solve for h...using the quadratic formula

but you're smarter than that...so you look at the answers and rule out the last one...because there is no way a number can be < 3 and > 4 at the same time

you also know that an object that goes up eventually comes down so if it goes higher than 192 at some point, it will then come back down below 192 later...so the time will be between two numbers.

Only one answer matches this...

anonymous · Answer

Its D! At least I think... I'm pretty positive it is, lol.

anonymous · Answer

For the third one, you want that distance, the formula they gave you to be *greater than* 300...

anonymous · Answer

Check that second one again...remember, a number can't be < 3 and > 4 at the same time...

anonymous · Answer

in other words, you can't have 3 > t and t > 4 at the same time...

anonymous · Answer

Okay, yeah, I figured number 3 out, but I'm having a hard time with number 2 for some reason. :/

anonymous · Answer

So looking at number 2, you only have 2 possibilities, right, A or D.

But for D, the number t would have to be less than 3 but bigger than 4...there is no such number.

So we can eliminate D.

anonymous · Answer

For number four, again, they *want* you to plug in 52 and solve the quadratic...but you are still too smart for them

You eliminate B because everything that goes up must come down...so you need two values

You eliminate C because at time t=0 you are at 4 feet...C says that the ball instantaneously goes from 4 feet to 52 feet...not very likely

You now have either A or D...and the question says "greater than *or equal* to" so you know the answer will have those inequality symbols in it...

anonymous · Answer

OH! Okay, I totally get number 2 now. And I understand number 4 too. Thank you so much, you were a big help. I just submitted my assignment, and I probably wouldn't have passed without you, so thanks. :)

anonymous · Answer

My pleasure...just make sure that if you *do* need to solve with the quadratic formula, you know how...tricks are nice, but knowing the real process is invaluable. :)

anonymous · Answer

Yes, thanks to you I actually get it now. :)