Worth 15 points need asap what is the value of x? right triangle with acute angles labeled x degrees and 66 degrees. 114 33 57 24

What is the standard form of -5x^2+2x^4-11+x^3+3x

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

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”?