Akira spent $21 to play 12 demo video games throughout the month. Sony charges $1.25 for new games and $2.75 for older games. Write and solve a system if equations to find out how many new games did akira play.​

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample