In a standard normal curve with u=500 and q=100 , what interval centered at the mean contains 68% of the data set?(the u and q are stand ins for the real symbols) 400 to 600
300 to 700
200 to 800
450 to 550

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap