Answers created by NGBRO

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• How do you evaluate #-423( 636) + 423( 287)#?
  
• What is the probability of B if they are independent events P(A)= 3/7, P(A then B)=1/3?
  
• On a scale drawing, a cell phone tower is 1.25 feet tall. The scale factor is #1/150#. What is the height of the actual cell phone tower?
  
• How do you calculate the average atomic mass of carbon if 98.90% of the atoms are C-12 (12.000000 and 1.100% are C-13 atoms (13.003354 amu)?
  
• How do you simplify #(sqrt9sqrt8)/(sqrt6sqrt6)?#
  
• How do you simplify #-12m(-9n)#?
  
• The exponential decay graph shows the expected depreciation for a new boat, selling for $3500, over 10 years. How do you write an exponential function for the graph. Use the function to find the value of the boat after 9.5 years?
  
• #Cu -> Cu^(2+) + 2e^-# What does this equation represent?
  
• How do you solve #3x+6y=9# and #2x+8y=10# using substitution?
  
• How do you use the amplitude and period to graph #of y=sin(x + (pi/2) )#?
  
• Question #87a00
  
• How do you simplify #7^(1 / 7) / 7^(-13 / 7)# leaving only positive exponents?
  
• How do you solve #4.2= 29.8- 8w#?
  
• Question #af4de
  
• How do you multiply #(4x + 3) ( 3x ^ { 3} - 4x + 14)#?
  
• #C_2H_4 + 3O_2 -> 2CO_2 +2H_2O#. If you start with 45 grams of ethylene (#C_2H_4#), how many grams of carbon dioxide will be produced?
  
• During the exponential phase, E. coli bacteria in a culture grown continuously. If the growth rate is 2.8% per minute and the current population is 124.0 million, what will the population be 6.3 minutes from now?
  
• Question #6797f
  
• How do you divide #\frac { \frac { 20x ^ { 3} y } { 7m n ^ { 2} } } { \frac { 5x ^ { 5} y ^ { 3} } { 14n ^ { 5} } }#?
  
• When #(n + 3) (n +2)! # is multiplied by # (n +4)# and then divided by #(n+ 2)!,# what is the result?
  
• Question #63acc
  
• The circumference of a circle is #11pi# inches. What is the area, in square inches, of the circle?
  
• Question #ea8a2
  
• How do you solve #\sqrt { 54+ 3x } = x#?
  
• How do you simplify #(x - 4) ( 3- 6x - 2x ^ { 2} ) #?
  
• A pulley system is used to lift a 2,000 newton engine up a distance of 3 meters. How much force will the operator have to apply if the mechanical advantage of the pulley system is 4?
  
• How do you write the equation of the line with slope of -5 and passes through the point (2, -4)?
  
• A charge of #12 C# is passing through points A and B on a circuit. If the charge's electric potential changes from #54 J# to #36 J#, what is the voltage between points A and B?
  
• Question #a5e2b
  
• The gas inside of a container exerts #8 Pa# of pressure and is at a temperature of #210 ^o K#. If the temperature of the gas changes to #30 ^oC# with no change in the container's volume, what is the new pressure of the gas?
  
• How do you use the quadratic formula to solve #1/2x^2-3x+2=3x-1#?
  
• How do you evaluate #4- [ 1+ 2( 3- 4) ^ { 2} ]#?
  
• Question #65e73
  
• How do you balance #NO_3^(-) + 4H^+ + Pb -> Pb^(2+) + NO_2 + 2H_2O#?
  
• Question #bca2e
  
• Question #4ee83