What is the mean absolute deviation (mad) of the data set?

{2, 5, 6, 12, 15}

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Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18