Final answer:
The value of the expression -9 x 2.2 is -19.8. We arrive at this by multiplying 9 by 2.2 to get 19.8 and then apply the negative sign as the original number was negative.
Step-by-step explanation:
The value of the expression -9 x 2.2 is calculated by multiplying the two numbers together. Since we have a negative number multiplied by a positive number, the result will also be negative. To carry out the multiplication, you multiply 9 by 2.2 and then apply the negative sign.