May I please have help? Thank you! And can you please tell me how you got the answer? Thank you again!
Simplify and write your answer as a decimal: 2(1-3/4) + 0.55

Factor this polynomial completely x^2-64

Is the square root of 4 plus the square root of 16 rational?

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%