Really need help! If sin x = 1/a , a does not equal 0, which statement must be true?
csc x = a
csc x= -1/a
sec x= a
sec x = -1/a

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

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?