Answers edited by Jacq

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• What is the domain and range of #y =9 - x^2#?
  
• Please help, can’t solve?
  
• Solve the equation #cos^2x-sin^2x=sinx+1# in the interval #(0<=x<=2pi)#?
  
• Martin wants to buy 4 plastic figures that cost $17 each. How much money does he need to save to purchase the figures?
  
• How do you simplify #10+2(-8-5b)#?
  
• How do you convert this equation #4x ^ { 2} + 8x + 3y ^ { 2} - 12y + 1= 0# to its graphable form?
  
• How do you simplify #\frac { 2x } { x ^ { 2} + 8x - 9} \div ( \frac { x ^ { 2} + 4x } { x ^ { 2} - 81} \cdot \frac { x - 9} { x + 4} )#?
  
• How do you graph #f(x) = |3x - 2|#?
  
• In how many ways can a 12- question true and false exam be answered?