Answers created by Fleur

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• What is the CRITICAL VALUE for a one-tailed t-test with df=54 and α=.05 ?
  
• What is the % variation in the food energy content in a packet chips? Full question in the description box.
  
• The time required to finish a test is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes. What is the z-Score for a student who finishes the test in 45 minutes?
  
• How do you simplify #sqrt(a^2)#?
  
• How do you simplify #((x^2-y^2)(x^2+xy+y^2))/((x^3-y^3)(x^2+2xy+y^2))#?
  
• A federal report stated that 88% of children under 18 were covered by health insurance in 2000. How large a sample is needed to estimate the true proportion of covered children with 90% confidence with a confidence interval of .05 wide?
  
• In Bengal, 30% of the population has a certain blood type.What is the probability that exactly four out of a randomly selected group of 10 Bengalis will have that blood type?
  
• Suppose a class of students have an average SAT math score of 720 and average verbal score of 640. The standard deviation for each part is 100. If possible, find the standard deviation of the composite score. If it is not possible, explain why.?
  
• Question #40687
  
• How do you use the z-score to determine #P(0<z<0.94)#?
  
• At 20.0°C, the vapor pressure of ethanol is 45.0 torr, and the vapor pressure of methanol is 92.0 torr. What is the vapor pressure at 20.0°C of a solution prepared by mixing 31.0 g methanol and 59.0 g ethanol?
  
• Find the derivative of y=tan sqrt{3x-1} (see equation in details) using chain rule?
  
• How do I simplify (sin^4x-2sin^2x+1)cosx?
  
• 10 moles of CH4 at R.T.P would produce what volume of CO2?
  
• How do I solve this problem? What are the steps?
  
• Question #8a13f
  
• How do you prove this identity?
  
• Question #08228
  
• Question #75a89
  
• A vehicle moves in a straight line with an acceleration of 6 km/h^2. By how much does the speed change each second? Answer in units of km/h.
  
• Question #2bca3
  
• Question #874fa
  
• I cannot get this right. The fraction (total time) is messing me up. Can you provide a step-by-step for this one?
  
• Question #6fb36
  
• Question #9b974
  
• What is the distance between the following polar coordinates?: # (1,(4pi)/3), (4,(pi)/6) #
  
• If an #11.9*g# mass of potassium chloride is dissolved in #256*mL# of water, what is the concentration of the solution?
  
• Question #c1c11
  
• Question #0bf2d
  
• Question #7a4c6
  
• Question #b7ed9
  
• Question #91ea7
  
• How do you solve #5\ln ( 5x + 1) - 17= - 27#?
  
• How do you add #(8+8i)+(-4+6i)# in trigonometric form?
  
• How do you find the reference angle of #theta=203^circ# and sketch the angle in standard position?
  
• Question #8ed74
  
• Question #64d1f
  
• Six less than a number is greater than 54, What is the number?
  
• How do you find the inverse of #f(x)=x^2-2# from #x<=0# and graph both f and #f^-1#?
  
• Question #5eda4
  
• Question #35634
  
• Find three consecutive odd integers such that the sum of the first, twice the second, and three times the third is 70?
  
• A circle has a center at #(1, -2)# and radius of #4#. Does the point #(3.4, 1.2)# lie on the circle?
  
• How do you graph #q(x)=-4abs(x-2)-1# using transformations?
  
• Question #af298
  
• How do you solve #\frac { 1} { c + 3} = \frac { 7} { c ^ { 2} - 9}#?
  
• How do you show that #f(x)=(x-1)/(x+5)# and #g(x)=-(5x+1)/(x-1)# are inverse functions algebraically and graphically?
  
• How do you divide #(16z x ^ { 3} - 20z ^ { 4} x ^ { 7} ) \div ( 4z ^ { 2} x ^ { 5} )#?
  
• How many feet are in a football field that is 100 yards?
  
• How do you convert #(2, (11pi)/6)# from polar to cartesian coordinates?
  
• Janet, an experienced shipping clerk, can fill a certain order in 3 hours. Tom, a new clerk, needs 4 hours to do the same job. How long does it take them working together?
  
• How do you find a fourth degree polynomial given roots #3i# and #sqrt6#?
  
• How do you use synthetic division to divide #(4x^3+16x^2-23x-15)/(x+1/2)#?
  
• Of the following: Hematopoiesis, Red marrow, Yellow marrow, Spongy bone, which does not belong?
  
• Question #55b9f
  
• Question #da231
  
• How do you write the equation for a circle with center of circle (-3,0) radius with endpoint (3,0)?
  
• How do you use the binomial theorem to expand and simplify the expression #(a+6)^4#?
  
• Are all isosceles triangles similar?
  
• What type of connective tissue anchors the skin to underlying muscle?
  
• Question #c0e76
  
• Question #e6d37
  
• A solid consists of a cone on top of a cylinder with a radius equal to that of the cone. The height of the cone is #9 # and the height of the cylinder is #12 #. If the volume of the solid is #15 pi#, what is the area of the base of the cylinder?
  
• Question #71188
  
• How do you simplify #root3(1/7)#?
  
• Question #da0ab
  
• Question #89e56
  
• A tiny statue of Tom Brady is 2 8/15 inches tall If the statue uses a scale of 1 inch 2.5 feet, what is Tom Brady's actual height?
  
• If an overlap develops between the ranges of two closely related species, and if the species occupy the same niche in the zone of overlap, what will probably happen in the zone of overlap?
  
• How do you simplify #sqrt3/sqrt7#?
  
• How do you make a Box and Whisker plot with the numbers: 60, 90, 90, 92, 100, 100, 100, 100?
  
• How do you find the remaining side of a #30^circ-60^circ-90^circ# triangle if the side opposite #60^circ# is 4?
  
• Question #9ec4b
  
• Question #a83d6
  
• How do you solve the #triangle ABC# given #A=50^circ, a=2.5, C=67^circ#?
  
• How do you write a rule for the nth term of the geometric term given the two terms #a_3=24, a_5=96#?
  
• Given the matrices #A=[(5,7),(-1,6), (3,-9)], B=[(8,3), (5,1), (4,4)], C=[(0,4),(-2,5), (7,-1)], D[(6,2), (9,0), (-3,0)]#, how do you find 4C?
  
• A quiz has 1 true-false question and 2 multiple choice questions that each have 4 answers. What is the probability that someone guessing all 3 answers will get 100% on the quiz?
  
• Question #1e38a
  
• A certain recipe asks for #1/4# cup of granola. How much is needed to make #3/4# of the recipe?
  
• How do you determine the two coterminal angle (one positive one negative) for the angle #-36^circ#?
  
• Is 0.363636... a repeating decimal?
  
• How do you use the graph of #f(x)=secx# to determine whether the function is even, odd or neither?
  
• Question #e9ec4
  
• Based on recent results, scores on the SAT test are normally distributed with a mean of 1652 and a standard deviation of 212. What is the probability that a randomly selected student has a SAT score greater than 1750?
  
• How do you evaluate #-2i ( - 2+ 3i )#?
  
• The ratio ofthe volume of milk to that of milk coffee in a cup of cappuccino is 2 : 5. How would you find the volume of the coffee in a cup of cappuccino if 150 mL of milk is used?
  
• How do you find #a_100# when #a_1=-30#, d=5?
  
• How do you find the polynomial function with roots #2 + 3sqrt3#?
  
• How do you solve #\sqrt { x } - 4= \sqrt { 9x }#?
  
• How do you simplify #2^8/2^3#?
  
• How do you simplify #(16x ^ { 8} y ^ { 6} ) ^ { 1/ 2}#?
  
• Question #ab74b
  
• Question #a84c7
  
• Question #2f05b
  
• Suppose a population of 50 crickets doubles in size every 4 months. How many crickets will there be after 5 years?
  
• How many ways can you choose a set of 9 pencils from a selection of 10?
  
• Why do plants use cellular respiration?
  
• Given #h (x) = -e^x#, how do you describe the transformation?
  
• Question #1a9c9
  
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