Thank you for your answer, but can't we substitue cos58 for 0.529919264233... which is an irrational number, so it has infinite significant numbers, and has no uncertainity? In that case, shouldn't the answer be 38.4?
I don't know, maybe the textbook I'm reading gave the answer wrong, but it's...
Homework Statement
What is the answer to (72.4meters)*(cos58)? How many significant figures does it have, and why?
Homework Equations
"The least number of significant figures in any number of the problem determines the number of significant figures in the answer."
cos58=0.529919264233...
The...