Help please asap my teacher if just giving it to us

What number should be added to both sides of the equation to complete this square? x^2-10x=7

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.