Tutors Answer Your Questions about Proofs (FREE)
Question 607887: Determine by showing work and using any method whether argument is valid
The number 91 is prime just in case it is not composite. The number 91 is not both prime and divisible by 2. The number 91 is divisible by 2. Therefore the number 91 is composite.
Click here to see answer by richard1234(7193)   |
Question 610046: my question is that i got the same conclusion as my instructor but with different methods and i was wondering if that is still ok. the instructions are to add just 2 statements to the premises to produce a formal proof of validity. ill provide my answers and his, thanks a lot.
1. (S.T) v (U.V)
2. ~S v ~T
Therefore U.V
My answer
3. (U.V) v (S.t) 1, Com.
4. U.V 3, Taut.
his answer
3. ~(S.T) 2, Dem.
4. U.V 1,3 D.S.
Click here to see answer by jim_thompson5910(35256) |
Question 616027: Hi just needed some help in solving this equation it may be invalid so means that it can't be solved or it may be valid meaning it can be solved and I am stuck so not sure if I am right or not. Here it is:
VxEy(Rxy) l- VxEy(Rxy & Ez(Ryz))
Thanks
Click here to see answer by Alan3354(69443)  |
Question 622920: The head of a fish is 9 inches long. The body length of the fish between the head and the tail is equal to the head plus the tail. The tail length is equal to the head plus one half of the body length between the head and the tail. This is enough information to work out that the total length of the fish is what? (Pencil and paper may be used.)
Click here to see answer by KMST(5328)  |
Question 632553: In the same amount of time a new production assembly robot can assemble 8 times as many
transmissions as an old assembly line. If the new robot can assemble 'x' transmissions per hour, how
many transmissions can the new robot and the old assembly line produce together in five days of round
the clock production.
Click here to see answer by josmiceli(19441)  |
Question 632981: When you square any integer, the last digit of the number you get will never be an eight.
Is this statement true, false, or sometimes true. Justify your result.
to prove this i've tried...
1^2=1 2^2 = 4, 3^2 = 9, 4^2 = 16, 5^2 = 25, 6^2=36, 7^2=49, 8^2=64, 9^2=81, 10^2 = 100
as you can see this is true for single digits i've tried double digits as well up till 30^2, and clearly enough the last digit is never an eight.
from what i've got above im guessing that this statement is true!
Click here to see answer by Edwin McCravy(20054)  |
Question 632981: When you square any integer, the last digit of the number you get will never be an eight.
Is this statement true, false, or sometimes true. Justify your result.
to prove this i've tried...
1^2=1 2^2 = 4, 3^2 = 9, 4^2 = 16, 5^2 = 25, 6^2=36, 7^2=49, 8^2=64, 9^2=81, 10^2 = 100
as you can see this is true for single digits i've tried double digits as well up till 30^2, and clearly enough the last digit is never an eight.
from what i've got above im guessing that this statement is true!
Click here to see answer by richard1234(7193) |
Question 665955: 1. (QvR)->(WvU)
2. W->P
3. Q.T
4. U->Z
5. S->M
6. Sv~Y
7. (PvZ)->~M :. ~Y
I need help solving this.
I have the following information:
8. Q 3, Simp
9. T 3, Simp
10. Q∨R 8, Add
11. W∨U 1,10, MP
12. U∨W 11, Com
13. ~~Q 8, DN
14. ~~T 9, DN
15. ~~Q∙~~T 13,14, Conj
16. ~(~Q∨~T) 15, DeM
17. ~(~T∨~Q) 16, Com
18. P∨Z 11,2,4, CD
19. ~M 7,18, MP
20. ~S 5,19, MT
21. ~S∨~Y 20, Add
22. ~Y∨~S 21, Com
23. ~(Y∙S) 22, DeM
24. ~(S∙Y) 23, Com
Click here to see answer by lynnlo(4176) |
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