Once i get a awsner to a math problem, how do i prove my answer

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

Select the correct answer from the drop-down menu. this graph represents the inequality x+2< 4,2x> 3,x+6< 12,2x> 12

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us