To do their own math they used pencil and paper. Otherwise they relied on mission control to perform the calculations and send them up via radio.
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Pencil and paper, and a radio link back to NASA where they could talk to men with slide rules.
Quadrilaterals are four-sided shapes that have a lot of use in math, like using them to determine the area of more complicated shapes.
Exponents are used in algebra which is an area of math. This is not an area covered in the early years of schooling because it is too complicated to understand then.
Bankers do all sorts of math, from simple addition and subtraction to complicated problems including compound interest, for example. Math is essential to any banking job. Today though, most of the math is done on computers, not by hand or by humans at all.
All of them. Only some are too complicated for high school students, or even undergraduates.