Substitution is best to use one one or both equations is already solved for one of the variables. Elimitation can be use if all variables have a coefficient other than 1.
Mean-53.4
Median-46
Mode-35
Range-54
Good luck!
D. Both the intake valve and the exhust valve are closed.
33/50 because it is biggest
Every 12th box gets a whistle and a ball because 12 is the lowest common factor of 6 and 4.