To find mean,
first add all the numbers together:
10 + 12 + 29 + 2 + 19 + 42 + 23 + 23 = 160
Then divide the total by the <em>amount </em>of numbers there are:
In this case, there are 8 numbers.
160/8 = 20
20 is your mean for this set of data
hope this helps
The correct justification is to multiply each side by -3 where W= -18
Answer:
-82
Step-by-step explanation:
Maybe you want the determinant of ...
![\left[\begin{array}{cc}5&9\\8&-2\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D5%269%5C%5C8%26-2%5Cend%7Barray%7D%5Cright%5D)
The determinant of a 2×2 matrix is the difference of the products of elements on the down diagonal and the up diagonal:
D = (5)(-2) -(8)(9) = -10 -72 = -82
The determinant of this matrix is -82.
So we know that surface area is top circle +bottom circle+ (circumfurence times height so) 2(π(radius)^2)+(height(2π(r))) so fill in the blanks
it's kind of hard to see but πr means pi times radius (r)
2πr^2+((4.2)(2)(π)(r))=628.3
factor out the 2 so the equation would mean
2((πr^2)+(4.2πr))=628.3
divide both sides by 2
πr^2+4.2πr=314.15
what's interesting is that the first few digits of pi are 3.1415 so we aproximate pi as 3.14 and divide both sides by 3.1415
r^2+4.2r=100
subtract 100 from both sides
r^2+4.2r-100=0
factor
(x-8.11812)(x+12.3181)=0
so (if xy=0 then x or/and y must be 0 so)we set them to 0 so
x-8.11812=0
x=8.11812
second one
x+12.3181=0
x=-12.3181
since radii (or any legnth) cannot be negative, we can cross this solution out so
radius=8.11812
Answer:
the fist one is equal to 20
