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Pi ≈ 3.141592

That's the digits I remember by heart :)

When I think about it, the next digit is 6, so it should have been written:

Pi ≈ 3.14159265

Do you mean an equilateral triangle?  If so, the altitude is a factor of (√3)/2 times the size of one side.  If the perimeter is 66, one side is 22, so the altitude is:

$${\frac{{\mathtt{22}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{3}}}}}{{\mathtt{2}}}} = {\mathtt{19.052\: \!558\: \!883\: \!257\: \!650\: \!2}}$$

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-3x + y - 8 = 0   ...(1)

2x² + 3x - y = 0 ...(2)

Add 3x - y to both sides of (1) to get 3x - y = -8

Put this into (2)

2x² - 8 = 0

Add 8 to both sides

2x² = 8

Divide both sides by 2

x² = 4

so x = ±2

Put this back into (1)

-3*(±2) + y - 8 = 0

Add 3*(±2) + 8 to both sides to get

y = ±6 + 8

or y = 14 and y = 2

So the two sets of solutions are x = 2, y = 14 and x = -2, y = 2

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3.14159265358979323846264338327950288

thats all i remember,.....

20 can go in 25 only 1 time (20x1=20, and then 20x2=40, which is too high)

Distribute the 3 ---> (3x+6)+1=24

Subtract the 1 ---> 3x+6=23

Subtract the 6 ---> 3x=17

The answer is 2.8333...

There is different ways to do this but this is the way I do it

why do you want to

9+10=19

is this some kind of joke?

If Bill's Bikes sold 43 and still had 56, that would mean they used to have 43+56 so x=43+56. All you need to do is add 43 and 56, and you'll get x.

geez its not really funny

its 19, for goodness sake.

can i totally join it sounds awesssssssomeee

well it would be one, one course.

0.66666666666666666666666666666666666666666666666666666,......

so on and on and on and on

$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}} = {\mathtt{19}}$$

Yeesh, ppl

That is not a funny joke 😒 but the answer is 19

It is 0.66

Good answer, rosala...!!!

$${\mathtt{19}}$$

27=1.5*i1+8*i1-8*i2

27=9.5*ii1-8*i2

------------------------

-26=2*i2-8*i1+8*i2

-26=-8*i1+10*i2

10*i2=-26+8i1

i2=-2.6+0.8*i1

----------------------

27=9.5*i1-8( -2.6+0.8*i1)

27=9.5*i1+20.8-6.4*i1

3.1*i1=6.2

i1=2

------------------------

i2=-2.6+0.8*i1=-2.6+0.8*2=-2.6+1.6=-1

i1=2   and  i2=-1

2/3 = 0.66666.....  with the 6 recurring for ever.

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Could also write this as

 $$\frac{1}{x}-1+2=\frac{7}{x}$$

or

$$1=\frac{6}{x}$$

Multiply both sides by x to get x = 6

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I think 6 is in the domain of the inverse function.  When f(x) = 6, x = -3, so f^-1(6) = -3.  This is on the linear part of the function.

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Irrational

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4:5 is a ratio that can also be written as 4/5 or, as a decimal, 0.8

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