#1 is true. The term they have in common is y with an invisible coefficient in-front of the second y term
#2 has zero like terms. 15 has no variable, and the other terms have different variables.
#3 has two like terms, that’s 9 and 8 which add to equal 17. The answer is 3x + 17 aka D.
#4 has two like terms, the numbers with the variable ‘n’. 4n + 7n = 11n. Your answer is 11n + 12 aka D
This is a ratio problem; the ratio of the length to width is constant (and therefore equal):
4 /6 = 15 / x
Now, with a ratio, we may do any allowable algebra operation: cross-multiply, invert both sides, multiply or divide both sides by the same amount, etc.
Let's cross-multiply:
4x = (15)(6)
x = 90/4
x = 22.5 in.
Answer: (-0.5, 4)
Step-by-step explanation:
Midpoint formula: 
(x1, x2)=(2, -3)
(y1, y2)=(2, 6)
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Hope this helps!! :)
Please let me know if you have any question or need further explanation
Your correct. It is what you put down
Answer: 18 c
Step-by-step explanation: since they have the same variables you can easily just add them together
