c. $\frac{x}{4}=10$

Step 1 ：Solve the equation \(\frac{x}{4}=10\) by isolating the variable x.

Step 2 ：Multiply both sides of the equation by 4: \(x = 4 \times 10\).

Step 3 ：Calculate the value of x: \(x = 40\).

Step 4 ：\(\boxed{x = 40}\)