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Find the x and y intercept of 9x54-6y?
I believe that you need an equation to solve for the x and y intercepts.
Which of the following are solutions to the quadratic equation below Check all that apply. x2 plus 7x - 8 0?
To solve the equation x^2 + 7x - 80, you would get x = 6.105 and x = -13.105, I believe.
What is the derivative of x to the power of ln x?
I don't believe that the answer is ln(x)x^(ln(x)-2), since the power rule doesn't apply when you have the variable in the exponent. Do the following instead:y x^ln(x)Taking the natural log of both sides:ln(y)ln(x) * ln(x)ln(y) ln(x)^2Take the derivative of both sides, using the chain rule:1/y * y' 2 ln(x) / xy' 2 ln(x)/ x * yFinally, substitute in the first equation, y x^ln(x):y' 2 ln(x) / x * x^ln(x)y'2 ln(x) * x ^ (ln(x) - 1)Sorry if everything is formatted really badly, this is my first post on answers.com.
How many ways can a librarian arrange 15 books on a shelf if she has 20 books?
More than you'd believe! The first book can be any one of twenty, the second any one of the remaining nineteen and so on until the fifteenth book can be any of the last six. This is 20 x 19 x 18 x 17 x 16 x 15 x 14 x 13 x 12 x 11 x 10 x 9 x 8 x 7 x 6 different arrangements, which multiplies to a 17-digit number! 20,274,183,401,472,000 or "twenty quadrillion, two hundred and seventy four trillion, one hundred and eighty three billion, four hundred and one million, four hundred and seventy two thousand" (in US figures). Do not attempt to check it in your local library!
What is 20 times x?
Well, honey, 20 times x is just 20x. It's as simple as that. Multiply that x by 20 and you've got your answer. Math doesn't have to be so complicated, darling.
