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Answer 1

Step-by-step explanation:

hey listen i have done the part b

part a karne ka time nahi mila

Answer 2

4(a)

${ \huge{ \blue{ \underline{ \underline{ \bf{ \red{ \mathtt{question}}}}}}}} \\ \\ </p><p>125 - [ -20 \: of \: (-16) + {15 ÷ (-5)}]</p><p> \\ \\ { \huge{ \blue{ \underline{ \underline{ \bf{ \red{ \mathtt{solution}}}}}}}}$

125 - [ -20 × -16 + {-3}]

125 - [320 + (-3)]

125 - [ 320 - 3]

125 - 317

- 192.

4(b)

${ \huge{ \blue{ \underline{ \underline{ \bf{ \red{ \mathtt{question}}}}}}}} \\ \\ [180 ÷ {12×10 - 15 ×9}] + 2 \\ \\ { \huge{ \blue{ \underline{ \underline{ \bf{ \red{ \mathtt{solution}}}}}}}}$

[180 ÷ {12×10 - 15 ×9}] + 2

[180 ÷ { 120 - 135}] + 2

[180 ÷ ( - 15)] + 12

-12 + 12

0

Hope it helps......

$\huge \boxed{ \mathbb{ \fcolorbox{orange}{red}{thanks}}}$