Answers edited by MattyMatty

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• How do you factor #x^4+2x^3y-3x^2y^2-4xy^3-y^4#?
  
• A biology quiz consists of 14 multiple-choice questions. Nine must be answered correctly to receive a passing grade. If each question has 4 possible answers,what is the probability that a student who guesses at random will pass?
  
• Could you show me some bijection between the #mathbb{R}-mathbb{Q}# and #mathbb{R}#?
  
• How to find the inverse function for a quadratic equation?
  
• Is the series #\sum_(n=0)^\infty1/((2n+1)!)# absolutely convergent, conditionally convergent or divergent?
  
• How to solve that??#int_2^8|5-x|dx=?#
  
• Question #2cb93
  
• Question #d8659
  
• What is DeMoivre's theorem?
  
• A stone is dropped from a helicopter hovering at a constant height of 490m. How long before the stone reaches the ground?
  
• Question #8e98f
  
• Question #5ac9e
  
• A ball is thrown vertically downwards from a height of 20 m with a initial velocity v0. It colloids with the ground, loses 50 % of its energy in collision and rebounds to the same height. The initial velocity v0 is .....??? Please explain it briefly.
  
• Show that the solutions for #1 + z^4 + z^3 + 2 z^2 =0# obey the condition #absz = 1# ?
  
• What happens here?
  
• A body of mass M is falling from a very high building. The drag force is given by F=kv^2 where k is a constant and v its velocity. How soon will it reach terminal velocity and what will the distance traversed be equal to?
  
• For the experiment of tossing a six sided die twice, what is the probability that the sum is odd or prime?
  
• What is the interval of convergence of #sum_{n=0}^{oo}[log_2(\frac{x+1}{x-2})]^n#? And what's the sum in #x=3#?
  
• Question #96660
  
• Polynomials??
  
• A boy has 20% chance of hitting at a target. Let p denote the probability of hitting the target for the first time at the nth trial. lf p satisfies the inequality 625p^2 - 175p + 12 <0 then value of n is?
  
• How does the air resistance affects the graph of a free falling body?
  
• The probability of A hitting a target is #2/3# and that of B is #4/5#. They both fire at the target. What is the probability that at best one of them hits the target? What is the probability that only one of them will hit the target?
  
• Question #6d6d5
  
• If #x^2 + x +1=0# find the value of #(x+1/x)^3 + (x^2+1/x^2)^3...(x^100+1/x^100)^3#?
  
• How do you solve #z^4+z^2+1 = 0# ?
  
• A pharmaceutical company claims that a new drug is successful in relieving arthritic pain in 70% of patients. Suppose that the claim is correct. The drug is given to 10 patients. What is the probability that 8 or more patients experience pain relief?
  
• How do I solve this limit ?
  
• A catcher catches a baseball that is traveling 126km/h. If the ball stops within 0.230s, what is its acceleration?
  
• What is the probability that the deal of a five-card hand provides a pair of aces?
  
• How to find the probability for this question? (see details below)
  
• How do you factorize #20p + 15pq - 60q^2-80q# completely?
  
• #2x^3+4x^2-13x+6# Can you factorise this please?
  
• What is 0.5! And how do you find it (can it be found without calculus)?
  
• How do you solve #81^x = 243^x + 2#?
  
• A ball is dropped from a height of 100 m at t = 0. Later, at t = 1.00 s, a second ball is thrown downward with a speed of 19.8 m/s. At what time will the two balls be at the same height?
  
• How do you factor #3x ^ { 5} + 9x ^ { 4} - 6x# completely?
  
• In how many ways can the digits in the number 6759957 be arranged?
  
• There are 5 blue crayons, 7 yellow crayons, and 8 red crayons. in a box. If one is randomly drawn and replaced 15 times, find the probability of drawing exactly four blue crayons?
  
• If you roll a single die, what is the expected number of rolls necessary to roll every number once?
  
• Is the series indicated absolutely convergent, conditionally convergent, or divergent? #rarr\4-1+1/4-1/16+1/64...#
  
• How to show #f(x)=|x|# It is differentiable everywhere except at the point x = 0 ?
  
• What is the general solution of the differential equation # y'''-y''+44y'-4=0 #?
  
• Question #738f7
  
• How to use DeMoivre's Theorem to find the indicated power of (sqrt 3 - i)^6 ?
  
• Particle travels 10m in 5sec and 10m in 3sec assuming constant acceleration what is the distance travelled in next 2sec? Ans:8.3m
  
• How do you solve a quadratic equation without using a formula?
  
• What is the empirical probability of flipping 4 coins and getting 4 tails?
  
• Why #lim_(x->oo) (sqrt(4x^2+x-1)-sqrt(x^2-7x+3)) = lim_(x->oo) (3x^2+8x-4)/(2x+...+x+...)=oo#?
  
• Question #12ac2
  
• Question #c5675
  
• 10^m-10^n is always a factor of 9 if m and n are positive integers?
  
• How are vapour pressure and boiling point inversely related?
  
• If we want to approximate the value of #cos 20°# with a polynomial, what minimum degree must be the polynomial so that the error is less than #10^-3#?
  
• How can i calculate the odds of a current passing in an electrical circuit in regards to a certain switch?
  
• A fair coin is tossed 60 times. Using the normal approximation to the binomial distribution, what is the probability that a head will show between 30 and 36 times inclusive?
  
• How do you find the limit (X-> 0) ? thank you
  
• A secretary introduces 9 letters in 9 envelopes. Let X be the random variable representing the number of letters that entered the correct envelope. How you find #E(X)# and #var(X)#?
  
• Question #7ec9a
  
• Find # int \ 1/(x^2 + x + 1) \ dx #?
  
• How to solve $$\int x^{4} (x^2+x+1)^{1/2}dx $$ ?
  
• A stone is dropped out of a balloon which is descending at #14.7 ms^-1# when the balloon is at an altitude of #49 m#. How long before the stone hits the ground?
  
• What is golden ratio?
  
• How do you factor 2x³−3x²−4x-4?
  
• Given #a > 0, b > 0, c > 0# calculate the minimum for #(a^x+b^x+c^x)/3# ?
  
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