Answer:
y is decreasing by 10units per second
Step-by-step explanation:
Given xy = 15
If x = 3
y = 15/3
y = 5
dx/dt= 6
Differentiating xy = 15 implicitly with respect to t using product rule
x
xdy/dt + ydx/dt = 0
Substitute the given value into the expression and solve for dy/dt as shown:
3dy/dt + 5(6) = 0
3dy/dt + 30 = 0
3dy/dt = -30
Divide both sides by 3
(3dy/dt )/3 = -30/3
dy/dt = -10
This means that y is decreasing by 10units per second (it is decreasing because of the negative sign)
The height of the pole is 96 feet
In mathematics, the Pythagorean theorem, or Pythagoras' theorem, is a fundamental relation in Euclidean geometry among the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides. This theorem can be written as an equation relating the lengths of the legs a, b and the hypotenuse c, often called the Pythagorean equation:[1]

Create a diagram of the scenario first. You would have a right triangle with a hypotenuse (longest side) of h + 4, a longest leg of h - 68, and one leg of length h to represent the pole.
Set up the equation
using the Pythagorean theorem (
).

On simplifying we get



Solving using quadratic formula

h1 = 96 feet , h2 = 48 feet
If height would have been 48 feet then the other side would have a negative value as as 48 - 68 = -20 .
Hence the height of the pole is 96 feet
Learn more about Pythagoras theorem here :
brainly.com/question/343682
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The least common multiple of each is 120
The factors are 6 and x + 5
You just add the values for volunteers that worked 16-20 hours and 21-25 hours which would be 50 + 10 = 60. So the total number of volunteers that workers more than 15 hours is 60.