7/9 because 7 is greater than 6 and the 9is greater than 8
Simply the standard deviation of the data values is the square root of the variance:

=18
Answer:
D)18
Answer:

Step-by-step explanation:
From the question we are told that:
Height of child 
Height of child's shadow 
Height of tree's shadow
Since position of Sun remains constant
Generally the equation for Height of tree h_t mathematically given by



Answer:
h(6) = 20
Step-by-step explanation:
h(x) = 2x + 8
h(6) = 2(6) + 8
h(6) = 12 + 8
h(6) = 20