Marcus did an experiment to find the average time it takes for a candle to burn. his
results are normally distributed. the mean time was 270 minutes with a standard
deviation of 30 minutes. what percentage of candles burned for longer than 300
minutes?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Worth 100 points need the answers asap first row -x^2 2x^2 (x/2)^2 x^2 x is less than 2 x is greater than 2 x is less than or equal to 2 x is greater than or equal to 2 second row -5 -5/2 4 5 •2 is less than x& x is less than 4 •2 is less than or equal to x & x is less than or equal to 4 •2 is less than or equal to x& x is less than 4 •2 is less than x& x is less than or equal to 4