exam Maths Puzzle Numerical Ability

gym is 21 years newer than the auditorium. the gym is also one fourth as old as the auditorium. how old is each building? choices for auditorium age: 26, 27, 28

write and equation to

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I am having problems with solving and graphing the following problem. Can you Help?

1. Plot the graph of the equation 2x+4y=10 and 3x+6y=12 and interperet the result. Sketch two normal distributions that show an alpha error of 0.05 and one of 0.10. Discuss what happens to the beta errors when alpha is changed.