What is the value represented by the the red, underlined digit in the number shown? The number is 18206

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

The trigonometric ratios sine and secant are reciprocals of each other