Answer:
a = 20
Step-by-step explanation:
The mean is calculated as
mean = 
= 
= 
Then
= 27 ( multiply both sides by 5 to clear the fraction )
115 + a = 135 ( subtract 115 from both sides )
a = 20
Answer:
i think its d
Step-by-step explanation:
im not sure but i think it is. hope this helps. i couldnt see very well lol
Answer:
-200 metre is less 450m because - 200 metre is negative.
Answer:
no bc they r swapped and 40 is higher
Step-by-step explanation:
k
1. Use Difference of squares: a^2-b^2=(a+b)(a-b)
(x+k)(x-k)=0
2. Solve for x and k
x=+-k
k=+-x
