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$9\cdot3=27$ is the area of the kitchen counter without the sink, and $2\cdot3=6$ is the area of the sink. so, the area of the kitchen counter is:

$27-6=\boxed{21}$

This is not a very clear question... although I think this is the answer:

variable: x

equation 1:$\dfrac{x}2+5$

equation 2:$\dfrac{x}4+8$

thx its correct

I am already a member. (jugoslav) 

1 lawn / (5 people 12 hours)  =   1 l / 60 p-h

1 / 60 p-h  x 3 hr = 3/(60  p)           60/3 = 20 people    needed      or      15 MORE people needed

To find the median of a triangle, you use the formula $MA=\dfrac12\sqrt{2CA^2+2BA^2-CB^2}=\dfrac12\sqrt{50+288-169}=\dfrac12\cdot13=\boxed{\dfrac{13}2}$

Equating  sums for  the interior angles, we  have  that

( 136  +176) (k/2)  =  180 (k - 2)   simplify

(312)k/2 =  180k - 360

156k  = 180k - 360

180k  -156k  = 360

24k  = 360

k =   360  /24   =   15 

In a right triangle , recall that   tangent of angle = oppsosite side / hypotenuse

tan? = 23/20

? = arctan ( 23/20) = ..........

c = 2/3 a

then

c -12  =  1/9 (a+12)    sub in the red equation  

2/3 a  - 12 = 1/9a + 12/9

a = 24 originally

explain please

Let  the measure of angle A =  x

And  the  measures  of  angle B and C =   4x  + 9

So

A  + B + C  =180        .......so.....

x + (4x + 9) + (4x + 9)  = 180        simplify

9x + 18  =180

9x  =180 - 18

9x = 162

x = 162  / 9 =  18

So...angle B  = angle C = 4 (18)  +  9  =   81°

There are three hands on a clock. The number of occurrences of right angles between the hour and minute hands in a 24-hour period is 44.

60˚ i think

Ok thx it's correct :)

Well whatever anyways I got the solution of it.

Lol I'm so sorry, I meant x = 8, not r = 8. I fixed it in the post now :)

SO x = 8?

Im asking for x...

x and r are directly proportional means we can write;  x = k*r where k is a constant.

To find k use the fact that x = 5 when r = 25, so   5 = k*25 .  You should be able to find k from this.

Then use that to find x when r is 40:  x = k*40

I'm pretty sure the answer is 8, because when r = 25 and x = 5, you have to divide r by 5 to get x. This way, because 40/5 is 8, I think that would be the answer you're looking for.

So x = 8.

volume of a sphere    4/3 pi r^3

4/3 pi r^3 = 4571 mm³

r = 10.295     mm    (new radius)                        1/2 r = 5.15      volume = 4/3 pi r^3 = 571.38 mm³  

Assuming that these are right triangles, I'll give you the area for each triangle in no particular order. 

A = 189.77 m²

A = 486 m²

A = 4744.19 m²

A = 180 m²

A = 1456.67 m²

A = 1950.23 m²

We  have a right riangle.....we know the  adjacent side to the angle and the hypootenuse....the  cosine  relates  these

To find the angle, we need to use the  cosine inverse  (arccos)

arccos ( 8/10)   ≈   37°