When rounding to the nearest ten, what is the least whole number that rounds to 840

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.

Will give a: 122 b: 90 c: 48 d: 180

Why is causation so much more difficult to prove than correlation?