Simplify the expression
5c+3-2c-4

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )