How do I find the surface area of a cube? Please help! Thanks

Answers

Answer 1

Answer: A= 6x²

6 being the number of faces and x² being the length of one edge squared.

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Determine whether the polynomial is a difference of squares and if it is, factor it. y^2 – 225

is a difference of squares: (y + 15)^2

is a difference of squares: (y – 15)(y + 15)

is not a difference of squares

is a difference of squares: (y – 15)^2

Answers

(y-15)(y+15) if you do (y+15)^2, then that'll be y^2 + 225

If y=-4 when x=10, determine y when x=5.

Answers

$y=-4 \n x=10 \n \ny =? \n x=5 \n ---------------- \n {\left \{ {{y=-4} \atop {x=10}} \right. }/ :2 \n \n {\left \{ {{\boxed{y=-2} \atop {x=5}} \right. } \n \n \text{Answer: y=-2}$

The fraction 8/9 is equivalent to what percent round your percent to the nearest tenth

Answers

O.888888
Rounded to the nearest 10
O.890

X squared minus 18x minus 144 equals 0. Solve by factoring.

Answers

x^2 - 18x - 144 = 0

Factorise:

We choose 2 numbers that add to -18, and multiply to 144, these numbers are +6 and -24, we put it into the brackets:

(x + 6)(x - 24) <- x = the interted sign of the numbers inside the brackets

E.g. +6 turns into -6 and -24 turns into +24

x must = -6 or = +24

Answer got deleted because I have to explain it better, which I will kindly do.
(x^2 - 18x - 144) = 0
What two factors add up to equal -18 AND multiply to equal -144?
For a product to be a negative, one of the factors have to be a positive, and the other has to be a negative (positive times a negative equals a negative).
And now that we know that, we know that the negative number has to be larger than the positive because of the -18.
What two factors add up to equal -18 AND multiply to equal -144?
Negative 24 and positive 6.
(x - 24)(x + 6)

How do I figure out what 1/10 of 6000 is?

Answers

The way I like to figure out problems like this is to write it out like,

1/10 = x/6000
(One over ten equals x over 6000)

Then you find out how much you multiplied 10 by to get 6000. To do this you can divide 6000 by 10 getting 600. The rule "what you do to the bottom you have to do to top" in this equation. So since you multiplied the bottom by 600 you have to multiply the top by 600 as well. 600 times 1 is just 600.

So your answer is, 600 is 1/10 of 6000.

Hope this helps and isn't too confusing.

4(2x-3) = use a property to write equivalent expression

Answers

This property is called the distributive property; multiplication can be distributed over addition (subtraction is an addition of a negative number)

and the equivalent expression is this one:

4*2x-4*3

we can simplify this;

8x-12

this expression is equivalent to the one in the question!

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