7.......................................
Answer
the answer would be C
Step-by-step explanation:
To calculate the mean of a set of numbers and them all together and divide by the amount of numbers.
Example:
Find the mean of 12, 25, 36.
12 + 25 + 36 = 73
73 / 3 = 24.33
Our mean is 24.33.
Answer:
-30
Step-by-step explanation:
5(-6)
-30
x(x)=x*x
So 5(-6)=5*(-6)
-30
- & - is +
+ & + is +
- & + is -
Answer:
a = 8
b = 4√5
Step-by-step explanation:
Corresponding sides of similar triangles are proportional.
short side/long side = a/16 = 4/a
a² = 64 . . . . . . multiply by 16a
a = 8 . . . . . . take the square root
__
hypotenuse/short side = b/4 = 20/b
b² = 80 . . . . . . . multiply by 4b
b = 4√5 . . . . . take the square root
_____
<em>Additional comment</em>
These relations for the right triangle can be summarized by the rule "the length of a segment that touches the hypotenuse is the geometric mean of the two hypotenuse segments it touches." In the case of b, that means ...
b = √((4)(4+16)) = 4√5
The same sort of relation applies to the unmarked vertical segment on the left:
c = √((16)(16+4)) = 8√5
And, we saw ...
a = √((4)(16)) = 8
Of course, if this rule is to make sense, you need to know that the geometric mean of two numbers is the square root of their product. (In general, the geometric mean of n numbers is the n-th root of their product.)