Math Problem Statement

Several calculus-related problems involving rates of change for a rectangle, ladder, kite, balloon, and dinghy.

Solution

The image contains several calculus-related problems involving rates of change. Here's a breakdown and outline of the types of problems present:

  1. Problem 1: Rates of Change for a Rectangle

    • A rectangle's length is increasing at a certain rate, while its width is decreasing at a different rate. We need to find how the area, perimeter, and diagonals of the rectangle change over time.
    • Given values:
      • dLdt=4cm/sec\frac{dL}{dt} = 4 \, \text{cm/sec} (rate of change of length)
      • dWdt=1cm/sec\frac{dW}{dt} = -1 \, \text{cm/sec} (rate of change of width)
      • L=17cmL = 17 \, \text{cm}
      • W=24cmW = 24 \, \text{cm}
  2. Problem 2: Ladder Problem

    • A ladder is sliding down a wall at a constant rate. The question involves determining the rate of change of the height of the ladder as the distance from the wall increases.
    • Given:
      • The ladder is 17 ft long.
      • The ladder is moving away at 5 ft/sec.
      • At some point, the base is 8 ft away from the wall.
  3. Problem 3: Kite Problem

    • A kite is flying at a certain height and moving horizontally. We need to find the rate at which the string must be let out as the kite moves away.
    • Given:
      • The kite is at a height of 60 ft.
      • The horizontal velocity of the kite is 3/4 ft/sec.
      • The kite is 170 ft away from the child.
  4. Problem 4: Balloon Problem

    • A balloon is inflating at a constant rate, and we need to find the rate at which the radius and surface area are changing.
    • Given:
      • The rate of volume change is 180 ft³/min.
      • The radius is 3 ft at a certain instant.
  5. Problem 5: Dinghy Problem

    • A dinghy is being pulled toward a dock, and the question involves calculating the rate at which the distance between the dinghy and the dock is decreasing.
    • Given:
      • The rope is being pulled at 3 ft/sec.
      • The boat is 8 ft away from the dock.

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Math Problem Analysis

Mathematical Concepts

Rates of Change
Derivatives
Related Rates

Formulas

Area of a rectangle A = L * W
Perimeter of a rectangle P = 2(L + W)
Diagonal of a rectangle D = sqrt(L^2 + W^2)
Pythagorean Theorem c^2 = a^2 + b^2
Volume of a sphere V = (4/3)πr^3
Surface area of a sphere A = 4πr^2

Theorems

Pythagorean Theorem
Chain Rule of Derivatives

Suitable Grade Level

Grades 11-12 (Calculus)