Answer: 3 - 2x
I’m not sure if you meant xxx or not.
Answer: 
Step-by-step explanation:
For this exercise it is important to remember the multiplication of signs. Notice that:

In this case you have the following expression given in the exercise:

Then you can follow the steps shown below in order to solve it:
Step 1: You must solve the subtraction of the numbers 0,65 and 3,21. Then:

Step 2: Now you must find the product of the decimal numbers above. In order to do that you must multiply the numbers.
(As you can notice, both are negative, therefore you know that the product will be positive).
Then, you get that the result is the following:

Same as the other one :) if u thought my answers were helpful to you please mark me as brainliest :)
We have that
using a graph tool
see the attached figure
the answer is the first option
y<=3x
y>-2x-1
Hi,
Perimeter AEDCB=3*10+15+20=65 (units)
Ratio of the similitude r*15=21==>r=21/15=1.4
Perimeter RQPTS=65*1.4=91(units)