Math Problem Statement

Suppose that y varies directly as the cube of x, and that y = 17 when x = 2. What is y when x = 10? Round your answer to two decimal places if necessary.

Solution

The problem in the image states:

  • yy varies directly as the cube of xx, meaning y=kx3y = kx^3, where kk is a constant.
  • Given: y=17y = 17 when x=2x = 2.
  • We need to find yy when x=10x = 10.

Step 1: Find the constant of variation kk

Using the given values y=17y = 17 and x=2x = 2:

y=kx3y = kx^3 17=k(23)17 = k(2^3) 17=k(8)17 = k(8) k=178=2.125k = \frac{17}{8} = 2.125

Step 2: Use kk to find yy when x=10x = 10

Now that we know k=2.125k = 2.125, we can find yy when x=10x = 10:

y=2.125×(103)y = 2.125 \times (10^3) y=2.125×1000y = 2.125 \times 1000 y=2125y = 2125

Thus, y=2125y = 2125 when x=10x = 10.

Would you like further details or explanations?

Here are some related questions you might explore:

  1. What is the formula for direct variation?
  2. How is the cube function x3x^3 different from the square function x2x^2?
  3. What happens to yy if xx is doubled in this problem?
  4. How does the constant of variation kk affect the relationship between xx and yy?
  5. Can direct variation also involve fractional powers of xx?

Tip: When solving direct variation problems, always start by determining the constant of variation kk using the initial conditions provided.

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Math Problem Analysis

Mathematical Concepts

Direct Variation
Cubic Functions

Formulas

y = k * x^3

Theorems

Direct Variation Theorem

Suitable Grade Level

Grades 9-11