Answers created by BB

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• How many valence electrons does #Cu# have?
  
• What are the measures of an interior angle of an 11-gon.?
  
• Calcium has 20 electrons. How many electrons are in the outer shell?
  
• Explain, in terms of bonding and structure, the difference in the melting point between SrCl2 and SiCl4. ?
  
• How do you find the slope given (2,6) & (-3,6)?
  
• How do you solve #4( w + 6) \geq 60#?
  
• What is the slope of a line y=-4?
  
• What is the the vertex of #y=(x -1)^2 + 2x +16#?
  
• Terry earned $90 plus 10% of his sales for a net of $159. How much were his sales?
  
• How do you solve #9 - x >10#?
  
• How do you solve # -6> x/2-4 #?
  
• How do you solve #7m + 4m = 99#?
  
• How do you solve 1/2(x-y) = 2 and 1/2(x+y)+1 = 0?
  
• Titration Problem - Calculate the concentration of 20.0 mL of an H2SO4 solution that requires 27.7 mL of a 0.100 M NaOH solution?
  
• How do you solve #6= - \frac { 3} { 8} + x#?
  
• How do you tell whether the system # y= -2x + 1# and #y = -1/3x - 3#has no solution or infinitely many solutions?
  
• What is the scientific notation of 568 billion?
  
• Do the oxidation numbers of every element in a chemical equation have to increase/decrease for it to be considered a redox reaction?
  
• 15 more than twice a number is -23?
  
• How do you find the slope and y intercept of #y = 5/4x + 17/2#?
  
• How do you graph the line that passes through (-1,5) perpendicular to the graph #5x-3y-3=0#?
  
• How do you factor #5y^2 - 2y - 3#?
  
• 46 is what percent of 69?
  
• How do you simplify #2m - [n - (m - 2n)]#?
  
• What are the intercepts of : #7y= - x + 2#?
  
• How do you use the quadratic formula to solve #3x ^ { 2} + 3x - 5= 0#?
  
• Sin30+sin60+sin90 ÷ cos30+cos60+cos90?
  
• How do you write #y=x^2-8x+20# into vertex form?
  
• For what value of #x# is #sqrt(28x)/sqrt2# equal to #7sqrt2#?
  
• If one gallon equals 3.78 litres, how many litres are there in three gallons?
  
• How do you simplify #\frac { y ^ { 2} + 9y + 14} { y ^ { 2} + 3y + 2}#?
  
• What is the vertex form of #y=-3x^2 - 5x + 9 #?
  
• A town's population increased by 1,200 people, and then this new population decreased by 11%. The town now has 32 less people than it did before the 1200 increase. What was the original population?
  
• If #g ( x ) = \root [ 3] { x ^ { 2} - 1} + 2\sqrt { x + 1} #, what is #g(3)#?
  
• How to solve 7 3/4 * 7 1/8?
  
• How do you solve #4x^2 - 5x=0# using the quadratic formula?
  
• What is the remainder when 1398 is divided by 11?
  
• A number is four times larger than the square of half the number. What is the number?
  
• Acetylene gas (C2H2) is produced as a result of the reaction CaC2(s) + 2 H2O(ℓ) → C2H2(g) + Ca(OH)2(aq). If 10 g of CaC2 are consumed in this reaction, how much H2O is needed? Answer in units of mol.
  
• How do you solve #8+ 8s = 10s#?
  
• How many grams of sulfuric acid can be produced by 3 moles of SO3?
  
• How do you solve cos x = -.8 for 0 < x < 2pi rounded to the nearest hundredth of a radian ?
  
• How do you solve 4sinx = 3 for 0°< x < 360° ?
  
• How do you solve 2tanx - 1 = 0 for 0° < x < 360° ?
  
• How do you solve using the completing the square method #x^2 - 4x =12 #?
  
• Whats the inverse function of f(x)=x²-4x+3?
  
• How do you write #9x^2 – 64# in factored form?
  
• How do you graph #f(x) = (x + 2)^2#?
  
• What is the molar mass and the mass of 5.0 mol of iron(II) phosphate, #Fe_3(PO_4)_2#?
  
• The sides of a triangle are 8, 10, and 14.0. Find the area of the triangle? Round to 2 decimal places
  
• Find the area of a 6-gon with side length 12? Round to a whole number.
  
• What is the equation of the line that goes through #(5,-1)# and has a slope of #3/2#?
  
• How do you write #y=-x^2-14x-47# in vertex form?
  
• If the molar mass of lindane is 290g/mol and the percent composition is 24.8% C,2.08% H, and 73.1% Cl, what is the molecular formula of lindane?
  
• How do you add #8c^2-4 + 2c^2-5c+6#?
  
• How do you simplify #2sqrt(10) times sqrt(6)#?
  
• How do you solve #(x+4) /( x-2)=12#?
  
• How do you find the x and y intercepts for a line that goes through (2,1) and (6,4)?
  
• How do you graph #y=x+7# by plotting points?
  
• What is the axis of symmetry for the graph #y=x^2-6x+2#?
  
• At a temperature of 280 K, the gas in a cylinder has a volume of 20.0 liters. If the volume of the gas is decreased to 10.0 liters, what must the temperature be for the gas to remain at a constant pressure?