What number should be the exponent on the 10 so that the two numbers are equivalent? 2.3 × 10 y = 0.0023

What is the correlation coefficient for the data? don't forget to turn the diagnoisticon (in the catalog menu of the calculator). r = answer (round to the nearest thousandth)

The sum of two numbers is 86, and their difference is 20. find the two numbers

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.