Ok so, 42 ft. by 42 ft.
$25 per square yard
1 square yard = 9 square feet
The total square footage is 1,764 ft.
Total square yards is 196.
The total cost would be $4,900.
1it is 10 because 4/2= 2 and 2*5=10
This is overdetermined. Without looking at the ratio (except for the order of the sides) the actute angles in a right triangle are complementary so the answer must be:
Answer: A=35°, C=90°, B=55°
We can do it the way they like.
7+18+11 =36
so to get 180 degrees we need to scale the ratio elements by a factor of 5.
7:18:11=35:90:55
A is the smallest. We see C is indeed a right angle and B is complementary to A.
<span>∇ · (|r| r)
=</span>|r| <span>∇ · ( r) + r </span><span>∇ · |r|
</span>
|r| =√x²+y²+z²
<span>∇ · ( r) =dr/dx +dr/dy+dr/dz= i+j+k
so
</span>∇ · (|r| r)
=<span>√x²+y²+z² (</span><span>i+j+k) + </span><span>(x i + y j + z k ) </span>∇ · |r|
∇ · |r|= 2(x+y+z)/<span>√x²+y²+z²
finally
</span>
∇ · (|r| r)
=<span> |r|</span><span> (i+j+k) + 2(xi+yj+zk)/</span><span> |r|=</span><span>|r| (i+j+k) + 2r/</span><span>|r|</span>