Ahigh school computer club has 15 members. in how many different ways can they choose a president and vice president? a.210 b.105 c.29 d.225

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)