48÷(-12) -169÷(-13) 144÷(-12) ) (-) 81÷(-9) com s contrs

48÷(-12) = -4

As, 48÷12 is 4

and sign of positive divide by negative is negative.

So, the answer is -4

-169÷(-13)=13

As,169 divide by 13 is 13

And, sign of negative divide by negative is positive

So, the answer is 13

144÷(-12)=-12

As, 144 divide by 12 is 12

And, the sign of positive divide by negative is negative.

So, the answer is -12

225.(-5)=-1125

As, 225 multiplied by 5 is 1125

And, sign of positive multiplied by negative is negative

So, answer is -1125

(-41).(-71)=2911

As, 41 multiplied by 71 gives 2911

And, the sign of negative multiplied by negative is positive

So, the answer is 2911

81÷(-9)=-9

As 81 divide by 9 is 9

And, the sign of positive divide by negative is negative.

So, the answer is -9

The sign of positive multiply by positive is positive

The sign of positive multiply by negative is negative

The sign of negative multiply by positive is negative

The sign of negative multiply by negative is positive

Similarly, The sign of positive divide by positive is positive

The sign of positive divide by negative is negative

The sign of negative divide by positive is negative

The sign of negative divide by negative is positive

So, the multiplication and division of signed numbers is same as multiplication and division of simple numbers.

And, we must consider the sign according to the rules.

Whereas in addition and subtraction, positive +positive = addition and sign is positive.

And negative +positive =subtraction and sign is the sign of larger between the two numbers.

And, positive +negative is subtraction and the sign is of larger between the two numbers.

And, negative+negative is addition and sign is negative.

b. 2 and 4

step-by-step explanation: