Answer -4.2
hope this helps
Given:
The cost function is
The revenue function is
To find:
The marginal cost, marginal revenue, and marginal profit functions.
Solution:
We know that,
The marginal cost, marginal revenue, and marginal profit functions are the derivatives of cost, revenue and profit functions respectively.
Marginal cost function is
Marginal revenue function is
Marginal profit function is
Therefore, the marginal cost, marginal revenue, and marginal profit functions are , and respectively.
Answer:
This is an RTD question. Here is a table based on the given information:
up/down . . . .rate . . . .time . . . .distance
upstream . . . . r-4 . . . . T . . . . 7
downstream . . . . r+4 . . . . T . . . .15
Now, rate x time = distance, so
time = distance / rate.
solve each for T and we get
T = (7/(r-4))
T = (15/(r+4))
set the times equal and we get
7%2F%28r-4%29+=+15%2F%28r%2B4%29
cross multiply to get
7r+%2B+28+=+15r+-+60
subtract 7r to get
28+=+8r+-+60
add 60 to both sides to get
88+=+8r
divide by 8 to get
r+=+8tep
Answer:
12.5 kg
Step-by-step explanation:
Starting mass = x
x + 12% = 14 kg
x + 12% = 1.12x
1.12x = 14 kg
Divide both sides of this equation by 1.12
x = 12.5 kg
Hope this helps :)