PLEASE HELP IM GOING TO FAIL WILL GIVE BRAINLESS

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?