Solve for x if \(25^{x} + 3(5^{x}) = 4\)
The mean of twelve positive numbers is 3. When another number is added, the mean becomes 5. Find the thirteenth number
Evaluate \(\frac{0.36 \times 5.4 \times 0.63}{4.2 \times 9.0 \times 2.4}\)
