"Betsy gets her hair cut every 28 days and Mary gets hers every 35 days"
Find the least common multiple of 28 and 35.
28 = 2²×7
35 = 5×7
LCM(28, 35) = 2²×5×7
= 140
1.54-.10=1.44
Subtract the two to find your answer
So after 100 its 105,112,119...........994
x=7(multiples of what we're finding), y=105(where we start from after 100), a multiplied by z=994
we have to find z
994=105+(z-1)7
994-105=7z-7
889+7=7z
896=7z
z= 128
U start with 17,985...u add a number and the result is still 17,985. There is only 1 way this can happen and that is if the number u added was 0.
17,985 + 0 = 17,985....this is the additive identity property...which simply states that u can add 0 to a number and it still keeps its identity.
