
First, combine like terms:

Now just simplify the coefficients of x and y. We do this by converting each pair of fractions to ones with a common denominator. Then we can combine them easily.


So the simplified expression would be

Step-by-step explanation:
Ithink the answer is3420
I believe it is 75% because he is selling them for $3 more than what he bought them for and bought them for $4 and 3 is 75% of 4, sorry if i'm wrong
How much left is the simply the area.
Area = length * width
Area = 7 feet * 2 2/9
Area = 7 * 20/9 = 140/9
Area = 140/9 square feet.
Total marks for five tests = 85 * 5 = 425
Total marks in six tests with 90% would be: 90 * 6 = 540
So, the remaining marks will be: 540-425 = 115
Student must earn 115 grade in order to reach other average score of 90%
Hope this helps!