Question

Help please due later today.....

Answer 1

Answer:

a- the sum = 0.0031

b- the fly is 0.0013 grams heavier

Answer 2

Answer:

Step-by-step explanation:

a).

2.2 × $10^{-3}$ + 9 × $10^{-4}$ =

2.2 × $10^{-3}$ + 0.9 × $10^{-3}$ =

( 2.2 + 0.9 ) × $10^{-3}$ = 3.1 × $10^{-3}$

b).

2.2 × $10^{-3}$ - 9 × $10^{-4}$ =

2.2 × $10^{-3}$ - 0.9 × $10^{-3}$ =

( 2.2 - 0.9 ) × $10^{-3}$ = 1.3 × $10^{-3}$