Final answer:
The number (2+5i) is a complex number which has a real part (2) and an imaginary part (5i).
Step-by-step explanation:
The number (2+5i) is a complex number, a mathematical entity that includes both real and imaginary parts. The real part is 2, and the imaginary part is 5i, where i is the imaginary unit (i2 = -1). Complex numbers are essential in mathematics, physics, and engineering, providing a powerful tool to represent quantities involving both real-world measurements and abstract mathematical concepts. In this case, 2+5i is a complex number with a real part of 2 and an imaginary part of 5i.