What is the value of the expression? (-4.2) (2) + 10

-8.4+10 = 10 - 8.4 = 1.6

Start with multiplication:

-4.2 x 2 = - 8.4 (it stays negative because there is an odd number of negative numbers (the - 4.2) being multiplied)

Then you add the product and 10 left:

-8.5 + 10 = 1.5

1.5 is your answer