> .0-y bjbj .{{0_aaaaaa$b+++_+_+++Z"+K0+$@$+$+ ++$ : My answer is rightwhy doesnt it work?
It could be one of a few things.
One possibility is that you have submitted your answer as a decimal approximation, where WebAssigns numerical tolerance requires your answer be closer (or exact). I would recommend using exact values (that is, fractions when relevant instead of decimal approximations) all the time.
If you need to input a fractional value in WebAssign, such as 3/7, just type "3/7". Note that WebAssign prefers fractions to decimals, as it compares your answer to determine whether it is within 1% of the "exact" fractional value it is looking for, so if you don't keep enough decimal places, your answer will be marked wrong. WebAssign does not know how to deal with mixed numbers either, so if you need to give the fraction "1 and 1/3," type it as "4/3" instead.
And WebAssign will do simple arithmetic (such as dividing 81 by 16, or adding 2 and 7) for you "in your answer blank!" If the question has not specified that you have to simplify, you can actually type in the calculation, not the answer, that WebAssign wants--ie, if you need to give the answer as the value of x^2 -2x+1 at x=7, you can type in 7*7 -2*7+1 and submit it, and WebAssign knows that is right.When we get to algebraic values, you seldom need to simplify either. You can write 3(x+1)-5 if thats the answer, without distributing the 3 and adding the constant terms together.
For more information on how WebAssign interprets your answers, consult "Answering Math and Science Questions" under WebAssign's "Help" link.
Another reason your answer may not be accepted is that you have not considered units. Many questions in MATH 1200 require you to consider x not as a number, but a number representing another type of quantity, such as years from 1973 or thousands of staplers sold. Be sure you have carefully read the question to determine what the answer wantsis it x? Is it y? Is it the year that x represents (ie. Add x to 1973) or the quantity of staplers x represents (ie. multiply by a thousand)? Think similarly about what might be the answer if the values of the function have units associated to it. The more you think about the meaning of your work, the more likely youll get the answer rightand understand the context of the calculus.
Additionally, it might be that youve got the wrong variable. WebAssign can work with algebraic answers involving variables, but it knows the difference between a little x and a capital X, so you should check that you typed the version of x required in the problem. Additionally, it happens too often that you get so involved in a problem, you forget that the problem has chosen to use t instead of x. It will turn out youve manipulated variables correctly, and switching x for t would clear up all your woes.
It is also possible that your answer wasnt right after all. Perhaps this is a rare problem where youre asked to simplify, but you didnt. Or you let a 10 turn into a 1. Or you didnt watch your negatives; remember, (-4)2 =(-4)*(-4)=16. Or you didnt expand an algebraic expression, such as (x-3)2, properly. Or you used point-slope form but forgot to move y0 correctly. There are a lot of things to look for. Some assignments have a Watch It button that demonstrates a solution, and that might help.
Finally, there is an outside chance WebAssign was wrong. If you think theres a chance that is the case, contact me so that I can look at what WebAssign is searching for in terms of an answer. If there is an error, we can report it to WebAssign and adjust the assignment accordingly. Note in 5 years of using WebAssign with thousands of students, weve only identified 3 errors in the whole system, so this is a pretty rare possibility.
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