Help I'm trying to do this but i cant

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6