Self Maths Puzzle

(1)get 24 by using 8,8,3,3 (2) get 45 by using 9,9,5,5 (3) get ans 42 by usisng 6,6,7,7 (4) get ans 12 by usisng 4,4,3,3 . USE THE ALL MATHEMATICAL SYMBALS REQUIRED. ALL ABOVE 4 PROBLEMS ARE UNIQUE FORMULA TO GET ANSWER.

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Self Other Question

In a two-digit number, if unit digit exceeds its ten's digit by 2 and the product of the given number and the sum of its digits is equal to 144, then what is the number? Find the 3 weights with an integer value that can measure all the weights from 1 to 13 Kgs.