The outside temperature at a place is - 20 degree Celsius and it drops 5 degrees every hour. How long it will take to reach the temperature zero degree Celsius?

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

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%

Rectangle bcde is similar to rectangle vwxy. what is the length of side vy? a) 1 7 b) 2 7 c) 3 7 d) 4 7