If the sin 30° is 1 over 2, then the cos ° = a60° ; 1 over 2
b30° ; square root 2 over 2
c60° ; square root 3 over 2
d30° ; 1

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

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”?

If abcde is reflected over the x-axis and then translated 3 units left, what are the new coordinates d? are he re