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3 years ago

Can you please help me evaluate this problems

Mathematics

1 answer:

Fofino [41]3 years ago

8 0

Answer:

16. 137

17. 89

18. 168

19. 50

20. 8

21. 96

22. 39

23. 5

24. -2

25. 7

Step-by-step explanation:

We have to follow BODMAS which is the acronym for Bracket, Of, Division, Multiplication and Subtraction.

We have to perform our calculations in this order. i.e., Solve the calculations in a bracket first then of and so on.

a = 12; b = 9; c = 4

16. a² + b - c² = (12)² + 9 - 4² = 144 + 9 - 16 = 153 - 16 = 137

17. b² + 2a - c² = 81 + 2(12) - 16 = 81 + 24 - 16 = 105 - 16 = 89

18. 2c(a + b) = 2 · 4 (12 + 9) = 8(21) = 168

19. 4a + 2b - c² = 4(12) + 2(9) - 4² = (48 + 18 - 16 = 66 - 16 = 50

20. [a² ÷ (4b)] + c = [12² ÷ 4(9)] + 4 = [144 ÷ 36] + 4 = 4 + 4 = 8

21. c²(2b - a) = 4²(2(9) - 12) = 4²(18 - 12) = 16(6) = 96

22. [bc² + a] ÷ c = [9(4²) + 12] ÷ 4 = [9(16) + 12] ÷ 4 = 156 ÷ 4 = 39

23. [2c³ - ab] ÷ 4 = [2(4)³ - 12(9)] ÷ 4 = [2(64) - 108] ÷ 4

= [128 - 108] ÷ 4 = 20 ÷ 4 = 5

24. 2(a - b)² - 5c = 2(12 - 9)² - 5(4) = 2(3)² - 20 = 18 - 20 = -2

25. [b² - 2c²] ÷ [a + c - b]

= [9² - 2(4)²] ÷ [12 + 4 - 9] = [81 - 32] ÷ [16 - 9]

= 49 ÷ 7 = 7

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<u>Answer: </u>

The population of a city has decreased by 38% since it was last measured. If the current population is 27,900 .Previous population of city was 45000.

<u> Solution: </u>

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