2x+y=-11; 3x-4y=11
how do i solve this by substitution?

Three coins are flipped. what is the probability that there will be at least two tails?

Which shows the correct lengths of side c in both scales? scale 1: 45 m; scale 2: 60 m scale 1: 60 m; scale 2: 45 m scale 1: 36 m; scale 2: 27 m scale 1: 27 m; scale 2: 36 m mark this and return save and exit

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?