If the graph of an exponential function is increasing is the domain always all real numbers

If an athlete can bike 6 miles in 25 minutes, how many miles will he bike in an hour and half if he continues to bike at the same rate?

Use the x-intercept method to find all real solutions of the equation. x^3-10x^2+27x-18=0

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.