Question 835997
I am only helping with the estimate.


{{{13(3/4)- (-2)(9/10)}}}

This will be positive, since you are starting with positive and subtracting a negative number.


Approximate the first term as about {{{12*(3/4)}}}, about 9.

The second term is about 2, a little less because {{{(9/10)}}} is near to 1, and you're doubling it.


The estimate is {{{highlight_green(9+2=11)}}}.