The product of any number and 0 is zero. The expression is 1*0-0/y. 1*0 is obviously 0. 0/y is the same thing as 0 * 1/y, which is also zero. 0-0 is 0, so the answer is 0.
Answer:

Step-by-step explanation:
(11)²=(6)²+ (y)²
121=36 +(y)²
y² =121 –36
y²=85

Picture on the left: y = 1/2x + 3
Picture on the right: y = -2x - 3
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3.right angle
4. Right angle
I believe the answer is 18, because 5x3=15, so we can only assume that N is 6x3=18.