How do I do this?!?! Pls help!!! 40 points!!

Answers

Answer 1

Answer: (2x + 16)(2x + 12) = 396
4x2 + 24x + 32x + 192 = 396
4x2 + 56x - 204 = 0
x2 + 14x - 51 = 0
(x + 17)(x - 3) = 0
x + 17 = 0 v x - 3 = 0
x = -17 or x = 3

you can exclude negative value because x cannot be negative :)
Checking:
(16+2*3) * (12 + 2*3) is equal ? 396?
True

So the walkway size is:
22 x 18

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Please help!? 5 Stars! :0 :(

Answers

OK. These problems are easy if you know the quadratic formula,
and they're impossible if you don't.

Here's the quadratic formula:

When the equation is in the form of Ax² + Bx + C = 0

then x = [ -B plus or minus √(B²-4AC) ] / 2A

I'm sure that formula is in your text or your study notes,
right before these questions. You should cut it out or
copy it, and tape it inside the cover of your notebook.
Then, you'll always have it when you need it, until
you have it memorized and can rattle it off.

The first question says 3x² + 5x + 2 = 0

Is this in the form of    Ax² + Bx + C = 0 ?

   Yes !       A=3 B=5   C=2

   so you can use the quadratic formula to solve it.

    x = [ -B plus or minus √(B²-4AC) ] / 2A

   = [ -5 plus or minus √(5² - 4·3·2) ] / 2·3

   = [ -5 plus or minus √(25 - 24) ] / 6

   = [ -5 plus or minus √1    ] / 6

   x =    -4 / 6 = -2/3
and
   x =    -6 / 6 = -1 .
_______________________________________

The second question says

   4x² + 5x - 1 = 0

Is this in the form of Ax² + Bx + C = 0 ?

   Yes it is ! A=4 B=5 C= -1

   so you can use the quadratic formula to solve it.

    x = [ -B plus or minus √(B²-4AC) ] / 2A

Now, you take it from here.

Which relations are functions and which are not functions?Column A Column B
1.
{(2, 2), (4, 4), (6, 6),
(8, 8)}
2.
{(0, 3), (3, 5), (5, 6),
(8, 4)}
3.
{(1, 2), (3, 3), (4, 8),
(6, 3)}
4.
{(3, 4), (5, 2), (5, 6),
(7, 3)}

A.
function
B.
not a function

Answers

A) A
B) A
C)A
D) B
Reason I know this is because if we look at the x number in all of these, if 2 are the same (like 2,6 and 2,4) then its a non function.
But if none of the x =the same value its a function.
Same goes for B
C
and now D, is a non function because out X's:
3
5
5
7
5 was repeated so it's a nonfunction.
Got it?

(I also just took this test XD)

What is the value of 62 tens

Answers

62 tens is equal to 620, so 62x10=620. Lets split the equation up, 60 x 10 = 600 , 2 x 10 = 20 , so now add 600 and 20, 600 + 20 = 620

Hopefully this helped you.

The value of 62 tens would be just like multiplying 62 by 10 so 62x10=620
Your answer is 620.

Hope this Helps

What is the slope of this line?