Find the equation of hyperbola having latus rectum is 4 and eccentricity is 3.​

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Y=4x^2+x-1 solve using quadratic formula

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”?