Answer:
x > 1.5
Step-by-step explanation:
I am not sure what exactly the question asks, because there doesn't need to be an absolute value bracket, but from what we can see, x is greater than 1.5, so the equation would be
x > 1.5
Answer:
Step-by-step explanation:
Given
See attachment for complete question
First, we calculate the water pipe length (AC):
The cost of laying across water is twice (2 times) laying on land.
So, the total cost (C) is:
Differentiate
To find the most economical cost, we simply minimize C' by equating C' to 0
Cross multiply
Take square of both sides
Collect like terms
Solve for
Solve for x
Rationalize:
Answer: 15
Step-by-step explanation: we use distributive property to find the answer
we basically multiply 5 by 3, which is 15.