Answer:
157 degrees
Step-by-step explanation:
the two angles should add up to 180 degrees, so 180 - 23 = 157
Answer:
it takes 3 ninth to equal 1/3
Step-by-step explanation:
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:
x = ±
Step-by-step explanation:
9x² - 4 = 0 ( add 4 to both sides )
9x² = 4 ( divide both sides by 9 )
x² = ( take the square root of both sides )
x = ± = ± = ±