Three years ago, sherman was twice as old as clive. if clive's present age is c, which expression represents sherman's present age in terms of clive's age ?

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.