Need some help with HW.

[Jakob95]

Ok I have to do this for HW. I had a test and I got a few wrong and my teacher told me to fix them at home. I don't know how to do them though can somebody help? I took a picture of each question.

7) http://img259.imageshack.us/f/hni0002.jpg/
3) http://img830.imageshack.us/i/hni0004y.jpg/
14) http://img708.imageshack.us/f/hni0005h.jpg/
17) http://img153.imageshack.us/f/hni0007k.jpg/
Graph I got the -(P>Q) V q wrong: http://img819.imageshack.us/i/hni0006o.jpg/

 

[Jakob95]

Help? Right now I mainly need help with question 17, the graph thingy, and 14.

 

[BloodyFlame]

I'm not too good at math, but I think #14 would be -w -> j.

 

[Zarcon]

For 17 it should be...if I still remember right anyway...
PQB = 6x + 15
BQR = 3x
BQR = PQA
PQB + PQA = 180 (degrees)
6x + 15 + 3x = 180
6x + 3x = 180 - 15
9x = 165
x = 18.3...3
PQB = 6x + 15
PQB = 6(18.3) + 15
PQB = 125

 

[Joe88]

took discrete math a few years so may be a little sketchy with it


14)
statement: (j)->(~w)
inverse: (~j)->(w)
converse: (~w)->(j)

 

[pocchama1996]

14.
inverse ~J>W
converse~W>J

 

[pocchama1996]

Im learning this same stuff right now in my honors geometry class.
wouldve helped with the graph but i cant see enough of it

 

[Jakob95]

Thanks I did all those questions. I actually have another question here it is.

For the given open sentence find a solution for the variable that will allow it to become a true statement given the domain: (4, 5, 6, 7, 8, 9)

6x +17 =89

EDIT: Don't worry I did the whole graph.

 

[Jakob95]

Anyone know the answer?

 

[pocchama1996]

12 is the only way for that to be true

 

[Jakob95]

How about this question.

5x^2 = 80. Given the domains (4, 5, 6, 7, 8, 9)

 

[pocchama1996]

Pretty sure x=4

 

[BloodyFlame]

Pretty sure x=4

Me too.

5x^2 = 80
/5 /5
x^2 = 16
sqrt sqrt
x = 4

 

[Joe88]

technically it can be 4, -4

 

[mameks]

technically it can be 4, -4

This. it has to be ±4