GUYS HELP I HAVE MID-TERMS

1. during first 10 seconds 2. between 10 seconds and 35 seconds 3. during 35 seconds to 40 seconds

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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%