Question

whoever will solve it i will mark him/her as a brainiest​

Answer 1

Answer:

1. Add

$(i) 2x,-3x,7x\\=2x+(-3x)+7x\\=2x-3x+7x\\=-1x+7x\\=6x$

$(ii)0.3a, 0.2a,-0.4a\\= 0.3+0.2a+(-0.4a)\\= 0.3a + 0.2a - 0.4a\\=0.5a - 0.4a\\=0.1a$

$(iii) 4pq,\frac{1}{2} pq,\frac{3}{2} pq\\\\\\=\frac{4}{1} pq + \frac{1}{2} pq +\frac{3}{2} pq (LCM=2)\\\\=\frac{8pq +1pq +3pq}{2} \\\\=\frac{11}{2}$

2.Subtract

$\\\(i) 3xy from 7xy\\=7xy - 3xy\\= 4xy$

$(ii) 3xy from -7xy\\= -7xy - 3xy\\=-10xy$

$(iii) -3xy AND 7xy\\= 7xy -(-3xy)\\= 7xy + 3xy\\= 10xy$

$(iv) -3xy from -7xy\\= -7xy - (-3xy)\\= -7xy + 3xy\\= -4xy$

3. Add

$(i) (2x - 3y) + (4y - z) + ( 2z + x) =2x + x - 3y + 4y - z + 2z =3x - y - z$