The first one is the answer.
It's the mean of (2.57 x 10) minus 4
The mean is the average.
Answer:
X=22.5
Step-by-step explanation:
Y=kX
20=15k
k=4/3
For X when Y=30
30=4/3×X
Cross multiply
4X=90
X=22.5
Answer:
-21
Step-by-step explanation:
6 and 10 because 6 times 10 is 60 and 6 plus 6 plus 20 plus 10 is 32
