# Posts by Genie_math

Total # Posts: 17

**Math**

19/4 + v = 137/8 v = 137/8 - 19/4 v = 137-38/8 v = 99/8 v = 12 3/8

*October 16, 2012*

**Math 8 - help!!!!!!!!!!!!!!!**

Sorry i made a mistake . Its 8 + 2d = 12 2d = 4 d = 2

*October 16, 2012*

**Math 8 - help!!!!!!!!!!!!!!!**

First multiply the 2 on the left hand side with each item in the brackets. 2*4 - 2*d + 2*2d = 12 8 - 2d + 4d = 12 Now add all the similar terms on left hand side. i.e 2d & 4d 8+4d = 12 now subtract 8 from both sides 8-8+4d = 12-8 4d = 4 d = 1 If I helped you then reply and ...

*October 16, 2012*

**chemistry**

In the physical sciences, an open system (system theory) is a system that matter or energy can flow into and/or out of, in contrast to a closed system, which no energy or matter may enter or leave.

*October 16, 2012*

**Chemistry**

Exothermic reaction - Energy is released - so it is less than zero. [Negative value] Endothermic reaction - Energy is absorbed - greater than zero [Positive value] Examples - Exothermic Reactions C(s) + O2(g) → CO2(g); ΔH = –393.5 kJ H2(g) + 1/2 O2(g) → ...

*October 16, 2012*

**Math 5th grade (decimals)**

2.08 = 2 + .08 = two and 8 one-hundredths 4.196 = 4 + 0.1 + 0.09 + 0.006 = four and one hundred ninety-six one-thousandths 53.5 = 50 + 3 + 0.5 = fifty-three and five tenths 0.6047 = 0.6 + 0.004 + 0.0007 = six thousand forty-seven ten-thousandths

*October 16, 2012*

**science**

Please be clear are you talking about Cassini Solstice Mission ??

*October 16, 2012*

**Math**

Total cards - 52 Total spades - 13 Total clubs - 13 The probability of selecting 2 cards - 52C2 Given - Second card is a club The first card to be a spade - 13C1 total probability - [13C1] [13C1] _______________ 52C2

*October 16, 2012*

**College Math Probability**

Let 1 <= k <= p−1, where p is prime. Show that p choose k is a multiple of p. What if p is not prime? I think here when we expand p choose k and then input few prime numbers then we always get a multiple of p . And same with when p is not prime.

*October 7, 2012*

**Math Coll**

Find the coeficient of x^18 y^32 z^25 in (x + y + z)^75? How many monomials appear in the expansion of (x + y + z)^75?

*October 7, 2012*

**Discrete math**

There are eighteen guard posts. How many ways can 25 not indistinguishable (That is, they are distinguishable.)guards be distributed to the guard posts, so that no post is empty? Try - (25 choose 18) ??

*October 3, 2012*

**Discrete math**

How many monomials appear in the expansion of (x + y + z)^75?

*October 3, 2012*

**Discrete math**

I need to find the coefficient of x^18 y^32 in (x+y)^50. I understand that we have to use the binomial theorem. I know how to find the coefficient for example x^18 but here we have "x" as well as "y" which I have no idea about.

*October 3, 2012*

**Discrete math**

I couldnot find the Q i posted that's why ... i replied there with some queries. Thank You for replying

*October 3, 2012*

**Discrete math**

Total ten pair of gloves are there. If I choose five gloves at random then whats the probability that there is at least one matched pair? What is the probability that I pick at least one right glove and one left glove?

*October 3, 2012*

**Math**

Ohk so it will be - 1st glove - 20 2nd glove - 18/19 3rd glove - 17/18 4th glove - 16/17 5th glove - 15/16 Total probability = 1 - the probability of above things right ??

*October 2, 2012*

**Math**

Wouldnt it be from 20 gloves as we have 10 pairs. So for first glove we can pick any. [19 remaining] For second glove we have to select from 18 which are different - 18/19 3rd glove - 16/18 4th glove - 14/17 5th glove - 12/16 ...

*October 2, 2012*

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