Is the number 6² rational or irrational

Solutions for 2x+7 less than or equal to 3x-5

Having a hard time understanding this question (see attachment).

Match each whole number with a rational, exponential expression 3 square root 27^2find the domain and range of the exponential function h(x)=125^x. explain your findings. as x decreases does h increase or decrease? explain. as x increases does h increase or decrease? explain.