Because of prevailing winds, a tree grew so that it was leaning 4 degrees from vertical. at a point 40 meters from the tree the angle of elevation to the top of the tree is 30 degree. find the height h of the tree.

Place the following steps in order to complete the square and solve the quadratic equation,

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 23 = 10x a. -1.93, 11.93 b. 1.93, -11.93 c. 1.93, 11.93 d. -1.93, -11.93

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”?