Question

In the following exercise, multiply or divide.

(a)$-36÷4$

(b)$-192÷12$

(c)$9\left(-7\right)$

(d)$-1\left(-19\right)$

Short answer

Part (a) The result of division is $-9$.

Part (b) The result of division is $-16$.

Part (c) The result of multiplication is $-63$.

Part (d) The result of multiplication is 19.

Step-by-step solution

Part (a) Step 1. Concept Used.

The result of multiplication or division of two numbers with same sign, is positive and with different signs, is negative.

Part (a) Step 2. Calculation.

Divide the opposite of 36 by 4.

$-36÷4=-9$

Part (b) Step 1. Concept Used. 

The result of multiplication or division of two numbers with same sign, is positive and with different signs, is negative.

Part (b) Step 2. Calculation.

Divide the opposite of 192 by 12.

$-192÷12=-16$

Part (c) Step 1. Concept Used.

The result of multiplication or division of two numbers with same sign, is positive and with different signs, is negative.

Part (c) Step 2. Calculation.

Multiply 9 with opposite of 7.

$9\left(-7\right)=-63$

Part (d) Step 1. Concept Used.

The result of multiplication or division of two numbers with same sign, is positive and with different signs, is negative.

Part (d) Step 2. Calculation.

Multiply the opposite of 19 by the opposite of 1.

$-1\left(-19\right)=19$