Estimate.
20+(-3.05)+(-9.8)
A positive and a negative are negative.
20-3.05-9.8
Since it said to estimate, I am going to put 3.05 as 3.10, and 9.8 as 10.
20-10=10
10-3.10= 7.90
If we wanted an exact answer, I would add .15 since we added it to the difference to make it easier to solve.
7.90+.15= 8.05
I hope this helps!
~cupcake
