A triangle with sides 6,8,10 has the same perimeter as a square with sides of length?

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)

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”?