Answer:
21 N
Step-by-step explanation:
let mass be m and weight be w
Given w varies directly with m then the equation relating them is
w = km ← k is the constant of variation
To find k use the condition m = 7 , w = 49 , then
49 = 7k ( divide both sides by 7 )
7 = k
w = 7m ← equation of variation
When m = 3 , then
w = 7 × 3 = 21 N
I think it is B
Sorry if wrong
Answer:
Because dividing is basically multiply by the inverse.
Step-by-step explanation:
Much like negating a number from a number is adding the later one to the flipped sign of the earlier number, dividing a fraction by a fraction means you multiply the later by the inverse of the earlier. To find the inverse of a fraction, you flip it upside down.
Answer: 1.12
Step-by-step explanation:
The confidence interval for the mean 
and margin of error E is given by :-
--------------(1)
The given confidence interval : (0.21, 2.45) -------------(2)
From (1) and (2), we have
Subtract equation (3) from (4), we get
Hence, the margin of error is 1.12 .
Answer:
2√10
Step-by-step explanation:
On the attached file
