Notebooks cost $1.50 each. This weekend they will be on sale for $0.80. What percentage is the sale?

33%

Step-by-step explanation:

To start take the original price and divide it by the new sale price.  $1.20/$0.80 = 0.66666.  We can then round that answer to 0.67.  if the new price is 67% of the original price we must then we know that 67% minus the 100% will give us the discount.  100% - 67% = 33%

Answer = 33%

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

  n=   0.0000 - 0.3750 i  

  n=   0.0000 + 0.3750 i

step-by-step explanation:

one of these should be correct