Need help solving the problem

How do i put 3(x+7) in distributive property

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.

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)