Question

Answer and work please help me

Answer 1

C.
3.1+1.28=4.38


`10 {}^( - 3) + 10 ^( - 4) = 10 {}^( - 7)`

`4.38 * {10}^( - 7)`

Answer 2

The answer is A.

First, multiply 3.1 and 1.28

3.1 x 1.28 = 3.968

Next, add the exponents.

3 + 4 = 7

So you get 3.968 x 10^-7

Hope this helped! ♡