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$3. \: {2 + 4^2} - 4+ 2 \\ = 2 + 16 - 4 + 2 \\ = 18 - 4 + 2 \\ = 14 + 2 \\ = 16 \\ \\ 4. \: {84 + 7}^(2) - 9 + 2 \\ = 91^(2) - 9 + 2 \\ = 8281 - 9 + 2 \\ = 8272 + 2 \\ = 8274 \\ \\ 5. \: {5 ^(2) + 7} + 5 - 6 \\ = 25 + 7 + 5 - 6 \\ = 32 + 5 - 6 \\ = 37 - 6 \\ = 31 \\ \\ 6. \: {4^(2) + 7} + 4 - 10 \\ = 16 + 7 + 4 - 10 \\ = 23 + 4 - 10 \\ = 27 - 10 \\ = 17 \\ \\ 7. \: 2 - {4 + 2}^(2) + 9 \\ = 2 - 6^(2) + 9 \\ = 2 - 36 + 9 \\ = - 34 + 9 \\ = - 25 \\ \\ 8. \: 3 - {6 + 3}^(2) + 9 \\ = 3 - 9^(2) + 9 \\ = 3 - 81 + 9 \\ = - 78 + 9 \\ = - 69 \\ \\ 9. \: {42 + 7}^(2) - 2 + 5 \\ = 49^(2) - 2 + 5 \\ = 2401 - 2 + 5 \\ = 2399 + 5 \\ = 2404 \\ \\ 10. \: {2^(2) + 5} * 2 - 7 \\ = (4 + 5) * 2 - 7 \\ = 9 * 2 - 7 \\ = 18 - 7 \\ = 11 \\ \\ 11. \: 6 * {66 + 11 - 5}^(2) \\ = 6 * 77 - 5^(2) \\ = 6 * 72^(2) \\ = 6 * 5184 \\ = 31104 \\ \\ 12. \: {78 + 13}^(2) - 8 + 5 \\ = 91^(2) - 8 + 5 \\ = 8281 - 8 + 5 \\ = 8273 + 5 \\ = 8278$

Please explain in steps!

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