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If you know the sine value and the cosine value, you can find the tangent value by using this formula:

     tan(x)  =  sin(x) / cos(x)

So:  tan(x)  =  [2/7] / [3√5/7]  

Multiply both the numerator and the denominator by 7:  tan(x)  =  2 / (3√5)

If you need to, you can rationalize the denominator.

OK....let's do this as follows

(5x -2) * (5x -2)  take both the terms in the first parentheses and distribute each over the terms in the second set of parentheses.....so we have....

5x(5x - 2)     - 2(5x - 2)

[25x^2 - 10x]    [-10x + 4]

So......combining like terms, we have

25x^2 - 10x - 10x + 4  =

25x^2 -20x + 4

Let's convert 5.1 ft to inches......we have

5.1 x 12 = 61.2 inches

So

61.2 (1.08) = 66.096 inches

And coverting this to back to ft, we have

66.096/12 = 5.508 ft

Still confused. Do not know where thee 10+10 came from that gave you 20 .. I do not get this at all.

Since the origin is the center, multiply both components of (6, 4) by 1/2......the result is your answer......

Think about this....

3^2   = 3 * 3

So

(5x - 2)^2    must be   (5x - 2) * (5x - 2)   ... and using "FOIL" we have

25x^2 - 10x - 10x + 4   simpliify

25x^2 - 20x + 4

If 8 of the 24 have broken seals, then we would expect that 1/3 of the packages would have broken seals.....so...

1/3 x 1200  = 400 packages

do you know any cheap math toters

Others might have a different take....but my estimate would be

70 x 20 x 140 =

70 x 140 x 20 =

9800 x 20 =

196000

I think this is

³√512 =

³√[64 * 8 ] =

³√[ 8 * 8 * 8 ] =

8

Press (2nd)

Then (asin)

Enter the value

Hit (=)

And ... what are you to do with this expression?

x / 3 = 15     multiply both sides by 3

x = 45

As in multiplying and dividing negative and positive integers?

Well, when you multiply or divide two positive integers, the product or quotient is always positive

If you multiply or divide one negative and one positive integer, the product or quotient will be negative

If you multiply or divide two negative integers, the outcome will be positive because they basically cancel each other out

Also, if you multiply or divide two negatives and then multiply or divide it by one more negative, the answer will be negative because you first had a positive, but then multiplied it by a negative which would become a negative

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This is from an old problem that i answered, on how to multiply and divide negatives

Now here's how to add and subtract:

Adding Negatives

negative + negative = positive

negative + positive = negative

positive + negative = negative

Subtracting Negatives

negative - negative = this depends on the order of the negatives, because for example if it's : (-2) - (-3) = 1 or (-3) - (-2) = -1

negative - positive = negative

positive - negative = positive

Oh okay! Thanks, CPhill

I'll give you all the points here, saseflower, since my answer basically echoed yours.....good job....

x+y=9 y=2x

Subbing the second equation into the first for y, we have

x + (2x)  = 9    simplify

3x = 9             divide by 3 on both sides

x = 3

And y = 2x  = 2(3)  = 6

So....our solution is

(3, 6)

x + y = 9

y = 2x

Place the 2nd equation into the first in place of y

x + (2x) = 9

Simplify

3x = 9

Divide on both sides

x = 3

Now we have to find y, so plug x into the 2nd equation

y = 2(3)

Multiply

y = 6

Now put x and y into point form (x,y)

(3,6)

^^ true, true!

you said the answer in your title of the question...

y = x + 3

y - 3 = x

In the second equation we can rearrange it as 

y = x + 3

This is the same as the first equation........so we have infinite solurions on this line

The total outcomes possible = C(9,2)  = 36

But, we're just interested in choosing 2 of the 3 dimes = C(3, 2)  = 3

So....the probability  is 3 / 36  =  1 / 12    =  8.33 %

Since these two lines have the same slope, and different y-intercept, they are parallel lines, and will never intersect to make a solution.

You first have to add the parts: .4 + .6=1

And you add that to the 2+3=5

5+1=6