Recent content by tofu

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    How Many Girls Excel at Singing but Not Dancing Among the Annie Auditionees?

    here it is Of the 21 young girls auditioning for the role of Annie, 9 were good dancers who couldnot sing well enough, but 5 could sing and dance well. Assuming that all girls possessed at least one of these skills, how many girls must have been good singers w/ out dancing skills
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    How many four-digit numbers contain no repeating digits and are even?

    need help on this question! How many #s are there btw 2000 and 9999 that a. contain no repeating digits? answer is 8x9x8x7 = 4032 ..right? b. are even, if no repeition is allowed from 0-9 there is 5 even #s so its 7x8x7x5 = 1960 ? right?
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    Finite Math Help: Similarities, Correlation Coefficient & Determination

    have some questions first, i would like to know what are the similarities and differences for the above terms.. also, a correlation coefficient ranges from -1 to 1 while correlation determination ranges from 0 to 1, why can't the correlation determination be negative? what can't the...
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    Proving dy/dx = (a+4b)x^(a+4b-1) for y = x^(2a+3b)/x^(a-b), a and b Integers

    Show that dy/dx = (a+4b)x^(a+4b-1) if y = x^(2a+3b) / x^(a-b) and a and b are integers thx
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