Suppose that the lifetime of tv tubes are normally distributed with a standard deviation of 1.1 years. suppose that exactly 20% of tubes die before four years. find the mean lifetime of tv tubes?

Aformual for 8 bottles of window cleaner calls for 6 cups of rubbing to customers alcohol 2 1/4 gallons of water and 1 1/2 cups of ammonia alcohol would the forula call if a factory made 1,280 bottles for stores to sell to customers

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

The functions below show the amount of money bella and sweet t had saved after earning money for doing chores. which description best compares the two functions?