When you multiply ANY two numbers the resulting number has decimal places that is the sum of each numbers' decimal places.
Here you have 0.47 with TWO decimal places and 0.18 with TWO decimal places the answer 846 (I did not consider the decimals yet) should have a total of FOUR decimal places...

Perimeter of a rectanlgle = 2(L+W) = 66 (given)
But the Length is 3 ft more than width → L = W + 3
Therefore 2(W+3+W) = 66
2(2W+3) = 66
Divide by 2 on boths sides
2W+3=33
subtract 3 from both sides
2W+3-3=33-3
2W=30
divide by...

(Yx2)+8=Y+12
2Y + 8 = Y + 12
Subtract Y from boths sides
2Y -Y + 8 = Y -
Y + 12
Y + 8 = 12
Subtract 8 form both sides
Y + 8 -8 = 12 - 8
Y = 4

Wrong Question. Where did point F come from?
You said ABC and EBD are pair of verticle angles. And then question went on givin some new angle EBF , but we do not know where point
F is? The way you gave the above question is not correct.

First place the equation i the standard format of ax2+bx+c. Your equation d2 + 2d - 8 = 0 is already in this format. Cool, now you need to find the product of the end terms (ac) = (1)(-8) = -8
Find the factos of -8 so that their sum adds up to the center term (b)= 2
(-4) X 2...

Leah is 6 years older than Sue. John
is 5 years older than Leah.
Total combined age is 41. How old is Sue?
Leah's age = 6 years +
Sue's age. John's age = 5 years +
Leah's age. Combined age of Leah + Sue + John = 41 years
Now let us their ages as; Leah's age = L years,...

4x2 + 12x + 9
Find all possible factors for 36 such that their product is 36 and sum ends up 12
Let us first distill it down to the lowest factors
36 = 4.9 = 2.2.3.3 = 2.3 X 2.3 = 6 X 6 (6+6 = 12!)
so 6 X 6 are the factors we want (other possible factors are 12X3,...

You have two unknown variables (x and y)
The question probably asked to solve for both or x or y. In any case you need TWO equations, since there are two unknowns. The question is therefore incomplete without a second equation
What is the complete question?