Math Is Fun Forum

Newman

Member

Registered: 2015-09-21

Posts: 42

Please help

Okay, a few of these are killin me. Please help and show work. Thank u so much!
#'s 1,3,4 and 6 please. So annoying because I can answer similar problems but missing some things...obviously.
THANKS!!
Test Guide

Last edited by Newman (2016-02-11 12:56:02)

evene

Member

Registered: 2015-10-18

Posts: 272

Re: Please help

For the following:

(1) I got (D)

(3) I got (B)

(4) I got (C)

(6) I got (E)

Newman

Member

Registered: 2015-09-21

Posts: 42

Re: Please help

how? can u plz show work?

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Please help

The formula to subtract two fractions:

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

evene

Member

Registered: 2015-10-18

Posts: 272

Re: Please help

Oh this is going to be long...

(1) In

, the LCM (Least Common Multiple) is

. So multiplying 3x-2 by x-2 and 2 by x+2 gives

.
Simplifying gives us

. Which gives us answer choice D

(3) Cross multiplying gives us

. Moving like terms to one side and constants to the other gives us

. So

(4)

. Plugging that in gives us

. Pretending that (x-1)(x+2) is one variable, we can factor it out to get

Dividing and simplifying gives us

which is answer choice C.

(6) Trigonometry... eheu! (Latin for Oh Dear!)
I noticed the 3 and the 5 in

, so I thought of a 3, 4, 5 right triangle. Drawing one, we see that the

is the angle between the hypotenuse of length 5, and the leg of length 4.

So

. Which is in this case, is answer choice E.

The answer choice is also less than

in case you were wondering.

Last edited by evene (2016-02-11 14:50:51)

Newman

Member

Registered: 2015-09-21

Posts: 42

Re: Please help

awesome! thank you. I'll study what u guyz posted.

Newman

Member

Registered: 2015-09-21

Posts: 42

Re: Please help

Sheesh, they seem so freakin obvious now. Haha. Thank you so much again or ur efforts to help me!