Can some one help me solve this

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 : )

Acheetah can run 70 per hour. what is the speed in feet per hour

The equation y=1/2x+4 is graphed. which equation would intersect this line at the point (4,6). a: y=6. b: y=6x. c: y=4. dy=4x