Determine how many different values can arise by inserting one pair of parentheses into the expression 7+4*5+6*3

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Describe the relationship between the angles of similar triangles and the sides of similar triangles

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”?