I think is
(x + y ) ( 2x - xy + 2y)
2x2 - x2y + 2yx + 2xy - xy2 + 2y2
Step-by-step explanation:
= 18 a³/ - 3 a
= - 6 a²
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Answer:
5 classes
Step-by-step explanation:
Let x be the amount of swimming classes the student took. We can use this to set up an equation:
12.50+8.75x=56.25
Subtract 12.50 from both sides
8.75x=43.75
Divide both sides by 8.75
x=5
The student took 5 swimming classes
This problem would just be x + (x +7) = 25. It can be simplified to 2x = 18, which can be further simplified to x = 9. 9 is one of your answers. To find the other number, just add 7. Your numbers would be 9 and 16, which do add to 25.