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## Answers by Arthur S.

First you must look for the longest chain of carbons to correctly determine the configuration. That is five carbons with a methyl group on number 4 so the second methylene group is attached to two other carbons and therefore secondary. There is one tertiary carbon and the primary carbons are...

Just to add to Elizabeth, The cores in your example are Argon and Krypton. Use the core a s a guide and as you add electrons to orbitals you would form new elements. In the example, 4s1 is potassium then 4s2 is Calcium then next orbitals are the 3d orbitals and you have ten electrons total...

To add to Cristina, The octet rule states that atoms look to have eight electrons in the outermost or bonding shell. Halogens have seven electrons in their outermost shell as an example fluorine has nine electrons, two of which or in the first orbital and seven in the second orbital. Fluorine...

Calendra, Are you looking for a molecular orbital explanation of this? Art

Nicolette, Assuming all operators are acceptable including powers, one such possibility is: 42 -22 +8 = 20 16-4+8 = 20 This assumes that powers can be added. I can find no way to 20 with just those operators you have listed. Arthur

I think this is best approached this way: If zero is the divisor then what dividend or value produces a result or quotient which is the number of times zero can be divided by it?  Suppose the divisor is 1 then then quotient is equal to the dividend but for zero we cannot determine how many...

Stacy, b = -2 therefore since the lines has no slope (m=0) it is horizontal with all values of x where y=-2 including it's intercept and (-4,-2) Art

Maribel, Not too hard really.  The term two step equation comes form the operations being performed which are done in you guessed it two steps. Example: 5X - 9 =31 Step 1 add 9 to each side 5X - 9 +9 = 31 +9 5X = 40 Step 2 divide each side by 5 5X/5 =...

Brenda, Water is said to be polar because there is a net negative charge at the Oxygen end of the molecule and a net positve charge at the hydrogens end of the molecule.  Water molecules therrefore behave like magnets in that they arrange themselves such that hydrogen bonds form between...

Samolia, First multiply by 11 so that [11(3x-1)]/4 = -5 then multiply by 4 so that 11(3x-1) = -5(4) Smplify 33x-11 = -20 add 11 to each side to get 33x = 11-20 and 33x = -9 divide by 33 x = -9/33 reduce x = -3/11 plug it...

what is 2x+3=x (answer)

Mary,  2x +3 = x You want to get like terms on each side of the equation so subtract x from each side to get 2x - x + 3 = x - x simplify to get x+3 = 0 then subtract 3 from each side x + 3 - 3 = -3 so x = -3 now plug this value back in to...

Anne, Observe that the sequence is decreasing by 1 1/4 each time.  so 7 1/2 - 1 1/4 = 6 1/4 and 6 1/4 - 1 1/4 = 5 therefore next in the sequence is 5 - 1 1/4 = ?  and so on and so on! Hope that helps! Art

Kailee, Inthe case of -7(n-1) you use the distributive property. so -7*n + -7*-1 the coefficient of n is +1 so a negative time a positive is a negative, while a negative time a negative is a positive.  Thus we get : -7n+1 now if say -7n +1 = 0 then you...

Casey, Yes but remember that for example 1/0.5 = 1/(5/10) so that you have to take the reciprocal of 1/(5/10) which is 10/5 = 2 so the decimal should be converted into a fraction for simplicity Hope that helps! Art

need an equation (answer)

Michaela, If the height = x then the base = x+3 and the equation is the sum of the heigh and the base is equal to 305 therefore x+x+3 = 305 2x +3 = 305 you can solve for x and will find that the base is indeed 3ft taller than the height. Base =...