The radius of mars is about 3400 km. olympus mons is a volcano on mars. at 27km high, olympus mons is the tallest volcano in the solar system. how far could an astronaut see on the surface of mars, standing on the peak on olympus mons?

The distance an astronaut standing at the peak of Olympus Mons can see will be solved using Pythagorean theorem,
c^2=a^2+b^2
thus
c^2= 27^2+3400^2
c=√11,560,729
c=3400.107 km

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.