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\(\color{aqua}\sqrt{20}=2\sqrt{5}\)

3 pence. It's impossible to make 3 pence with 4 and 5 pence stamps.

.......

Do you mean 5w+3w=64?

5w+3w=64

8w=64

w=8

x-y=2 ----(1)

x+y=8 ---- (2)

(1)+(2): 2x=10

x=5----- (3)

Subst. (3) into (1)

5-y=2

y=3

Therefore x=5 and y=3

Solve for x:
x^2+5 x+6 = 0

The left hand side factors into a product with two terms:
(x+2) (x+3) = 0

Split into two equations:
x+2 = 0 or x+3 = 0

Subtract 2 from both sides:
x = -2 or x+3 = 0

Subtract 3 from both sides:
Answer: | x = -2     or     x = -3

120

111

70,000 is what percent of 145 trillion

70000/145000000000000*100 = 0.0000000482758621%

Look here

111

See if this helps you understand

30% of 400 = 30/100*400 = $120

5x^2 - 25x

\(5x^2 - 25x\\ =5*x*x - 5*5*x\\ \mbox{you can take 5 and x out of both these terms}\\ =5x(x-5)\)

\(x^2-7x+6\)

Look for two numbers that multiply to give +6  and add to give -7

Sionce they multiply to give a positive number they must BOTH be negative or BOTH be positive.

Since that add to a negative they both must be negative numbers.

ok they multply to +6

-6 and -1     add to -7

-3 and -2     add to -5

ok so the numbers i am looking for are -6 and -1

\(x^2-7x+6=(x-6)(x-1)\)

Simplify the following:
(8 x^5 y^3)/(2 x y^4)

8/2 = (2×4)/2 = 4:
(4 x^5 y^3)/(x y^4)

Combine powers. (4 x^5 y^3)/(x y^4) = 4 x^(5-1) y^(3-4):
4 x^5-1 y^3-4

5-1 = 4:
4 x^4 y^(3-4)

3-4 = -1:
Answer: |  4x^4y^-1

Look carefully in your Physics textbook and you will find ALL the formulas and answers there.

If a couple plans to have 7 children, what is the probability that there will be at least one boy? Assume boys and girls are equally likely

The probability of NOT having any boy is:

1 / (2^7) =0.0078125, therefore the probability of having AT LEAST one boy is:

1 - 0.0078125 =0.9921875 x 100 =99.21875%

https://en.wikipedia.org/wiki/Coin_problem

According to wikipedia: "With only 2 pence and 5 pence coins, one cannot make 3 pence, but one can make any higher integral amount."

So the answer is three..?

on a calculator:  174 divided by 700 = 25%

To figure out a percentage in the future:

Set up your question like this to find a percent:

174 is what % of 700?

is: =

what: X

of: (multiply) 

174=X% (700)

"X" has to be alone, so you divide 700 by 700 so that is 1

Any step you do to one side of the = sign, you must do to the other.

Now that "X" is alone, you must divide 174 also by 700

you divide 174 by 700

174 divided by 700 =0.24857.....

turn your decimal into a percent (move that decimal two spots to the right) 

25% (round the 4 to a five because the number next to the 4 is higher than 5)

What is 86.4 kilos in stones and pounds

86.4 x 2.2046=190.48 pounds

190.48 / 14=13.61 stones

Solve the following system:
{x-y = 2 |     (equation 1)
x+y = 8 |     (equation 2)
Subtract equation 1 from equation 2:
{x-y = 2 |     (equation 1)
0 x+2 y = 6 |     (equation 2)
Divide equation 2 by 2:
{x-y = 2 |     (equation 1)
0 x+y = 3 |     (equation 2)
Add equation 2 to equation 1:
{x+0 y = 5 |     (equation 1)
0 x+y = 3 |     (equation 2)
Collect results:

Answer: x=5        y=3
 

Well first things first I would convert the units from mixed fractions to improper fractions so they are easier to work with. Doing that we would get....

\(\frac{20}{3}\) pounds of walnuts

\(\frac{4}{3}\) pounds per container

Now that we've done that we can go back to determining how to solve the problem. There are 20/3 pounds of walnuts. To find out how many  4/3 lb contains, we would have to divide the pounds of walnuts (20/3 pounds) by the pounds per container (4/3 pounds):

\(\frac{\frac{20}{3}}{\frac{4}{3}} \)

Flip the denominator and multiply it by the numerator.

\(\frac{20}{3} * \frac{3}{4} = \frac{60}{12} \)

60/12 equal 5, so the answer would be that the walnuts fill 5 containers

First what you want to to do it set up an inequalty. 80% as a fraction is 80/100. You would set that equal to a fraction where x is the number in place of 80% over 1400.
\(\\ \frac{80}{100} = \frac{x}{1400} \)

After this step cross multiply and you get...

\((80)(1400)=100x\)

Solve for x and you will get the answer, which is:

\(x = 1120\)

Pelp please would have been a LOT more polite than help fast  !!!!

You would also be more likely to get a fast answer!

Anyway....

How many different non-congruent isosceles triangles can be formed by connecting three of the dots in a 4*4 square array of dots like the one shown below?

I get 18 but I might have missed a whole lot out.  :///