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(a + b)/(a - b) = (c + d)/(c - d) cross multiply

(a + b)(c - d) = (a - b)(c + d)

ac - ad + bc - bd = ac + ad - bc - bd

-ad + bc = -bc + ad

-ad - ad = - bc - bc

-2ad = -2bc

ad = bc that is the product of the means equals the product of the extremes

a/b = b/c

Q: How is a plus b over a minus b equals c plus d over c minus d?

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That depends what the values of k and b are.

All the time

Commutative, not communtative The mathematical property of being able to change the order of the numbers and not change the answer. A plus B equals B plus A (1 plus 3 equals 4, 3 plus 1 equals 4) A times B equals B times A (2 times 5 equals 10, 5 times 2 equals 10) Addition and multiplication are commutative operators A minus B is not necessarily equal to B minus A (6 minus 4 equals 2, 4 minus 6 equals minus 2) A divided B is not necessarily equal to B divided A (9 divided by 3 equals 3, 3 divided by 9 equals one-third) Subtraction and division are not commutative operators

320 tolerance +/- 20 ? Did I get it right?

20a plus 14 will be 34a minus 8a minus 7 34a minus 8 is 26a minus 7 is 19a. The single b is 1b plus 6b which is 7b minus 2b equals 5b.

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x equals negative b plus or minus the square root of b squared minus 4bc over 2a

That depends what the values of k and b are.

All the time

C minus B equals AB

If a equals 3 and b equals minus 5 then a minus b equals what

Commutative, not communtative The mathematical property of being able to change the order of the numbers and not change the answer. A plus B equals B plus A (1 plus 3 equals 4, 3 plus 1 equals 4) A times B equals B times A (2 times 5 equals 10, 5 times 2 equals 10) Addition and multiplication are commutative operators A minus B is not necessarily equal to B minus A (6 minus 4 equals 2, 4 minus 6 equals minus 2) A divided B is not necessarily equal to B divided A (9 divided by 3 equals 3, 3 divided by 9 equals one-third) Subtraction and division are not commutative operators

the y-1 is a minus .

A=8 B=4 C=14 Yes, I know I'm a genius. Mak - the all knowing one. MWAHAHAH!

320 tolerance +/- 20 ? Did I get it right?

a - b = c -(a - b) = -c b - a = -c

20a plus 14 will be 34a minus 8a minus 7 34a minus 8 is 26a minus 7 is 19a. The single b is 1b plus 6b which is 7b minus 2b equals 5b.

its B