First, we take 70 x 2 =140 and then 7x2 =14. Add 140 to 14 to give 154 as the answer.
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2 x 2 x 7 x 7 x 7 or 2^2 x 7^3
2744 = 1 x 1 x 2 x 2 x 2 x 7 x 7 x 7 Make 3 groups of these factors and multiply the numbers in each group to get 3 numbers, eg: {1}, {1}, {2, 2, 2, 7, 7, 7} = 1 x 1 x 2744 {1}, {1, 2}, {2, 2, 7, 7, 7} = 1 x 2 x 1372 {1, 2}, {1, 2, 7}, {2, 7, 7} = 2 x 14 x 98 {1, 2, 7}, {1, 2, 7}, {2, 7} = 14 x 14 x 14 There are many more such answers.
x - 2 = 7 so x - 2 = 7 then convert that into an addition problem: 7 + 2 = x then add: 7 + 2 = 9 therefore x = 9
14000 = 14 x 1000 = 2 x 7 x 10 x 100 = 2 x 7 x 2 x 5 x 2 x 50 = 2 x 7 x 2 x 5 x 2 x 2 x 25 = 2 x 7 x 2 x 5 x 2 x 2 x 5 x 5 = 24 x 53 x 7
2 x 6174 2 x 2 x 3087 2 x 2 x 3 x 1029 2 x 2 x 3 x 3 x 343 2 x 2 x 3 x 3 x 7 x 49 2 x 2 x 3 x 3 x 7 x 7 x 7