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m = 146

Step-by-step explanation:

m - 82 = 64

m = 64 + 82

m = 146

m = 146

Step-by-step explanation:

m - 82 = 64

m - 82 + 82 = 64 + 82

m = 146

 m = 146

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.