All angles are the same in congruent triangle.
The total cost for peaches is $0.40 you get that by (0.5)(0.80) as for oranges (0.7)(.90)=$0.63 so $0.40+$0.63=$1.03
He can make 12 or 9 because 9x4=36 and 12x3=36
Then you are able to substitute in X and it can have a infinite number of values catered to the question.
First simplify this inequality:

Now you can graph this inequality. Draw the vertical dashed line x=3 and shade the region to the right from this line. This is exactly the region that represents the solution of inequality (see attached diagram for details).