Simplify the expression
(6++i)

4+5i.

Step 1: Remove the, unnecessary, parentheses.

(6+6i)-(2+i)

=6+6i-2-i

(the signs of the numbers in the second parentheses change because of the minus sign in front of it)

Step 2: Collect Like Terms.

=6-2+6i-i

Step 3: Subtract.

=4+5i.

(6+6i)-(2+i) = 4+5i.

6.9 oz and 8.1 oz

Explanation:
The data collected by Lucilla is as follows:
7.1 oz
6.9 oz
7.3 oz
7.6 oz
8.1 oz
7.5 oz

We need to put this data in order, this will give us:
6.9 , 7.1 , 7.3 , 7.5 , 7.6 and 8.1

We can note that:
smallest value is 6.9 oz
largest value is 8.1 oz
all other values fall in this range

Therefore, the weight of an orange based on her calculations is between 6.9 oz and 8.1 oz

Hope this helps :)