Question

a girl who is going in wedding ۔spray some long lasting perfume behind her ears ۔afew a minutes latter she realize she cannot smell the perfume any more this is because
A)it has all evaporated B) her sense of smell become use to that smell​

Answer 1

Answer:

3a2b, -4a2b, 9a2b

(ii) 2/3a, 3/5a, -6/5a

(iii) 4xy2

– 7x2

y, 12x2

y -6xy2

, -3x2

y + 5xy2

(iv) 3/2a – 5/4b + 2/5c, 2/3a - 7/2b + 7/2c, 5/3a + 5/2b – 5/4c

(v) 11/2xy + 12/5y + 13/7x, -11/2y – 12/5x – 137xy

(vi) 7/2x3

– 1/2x2 + 5/3, 3/2x3 + 7/4x2

– x + 1/3, 3/2x2

-5/2x -2

Solution:

(i) 3a2b, -4a2b, 9a2b

Let us add the given expression

3a2b + (-4a2b) + 9a2b

3a2b – 4a2b + 9a2b

3a2b

(ii) 2/3a, 3/5a, -6/5a

Let us add the given expression

2/3a + 3/5a + (-6/5a)

2/3a + 3/5a - 6/5a

Let us take LCM for 3 and 5 which is 15

(2×5)/(3×5)a + (3×3)/(5×3)a – (6×3)/(5×3)a

10/15a + 9/15a – 18/15a

(10a+9a-18a)/15

a/15

(iii) 4xy2 – 7x2y, 12x2y -6xy2

, -3x2y + 5xy2

Let us add the given expression

4xy2 – 7x2y + 12x2y – 6xy2 – 3x2y + 5xy2

Upon rearranging

4x2 + 12x2y – 3x2y – 7x2y – 6xy2 + 5xy2

3xy2 + 2x2y

(iv) 3/2a – 5/4b + 2/5c, 2/3a - 7/2b + 7/2c, 5/3a + 5/2b – 5/4c

Let us add the given expression

3/2a – 5/4b + 2/5c + 2/3a - 7/2b + 7/2c + 5/3a + 5/2b – 5/4c

Upon rearranging

3/2a + 2/3a + 5/3a – 5/4b - 7/2b + 5/2b + 2/5c + 7/2c – 5/4c

By taking LCM for (2 and 3 is 6), (4 and 2 is 4)

Answer 2

Explanation:

b is the correct answer of the question