book Maths Puzzle Numerical Ability

How many numbers from 100 to 5000 have all their digits in descending order. ex 743

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book Other Question

Dear Tutor,
How do you write an equation that shows the relationship between two numbers?
Thank you Find the value of the following polynomial for the given values of the variable.

Value #1: x = -3
Value #2: x = -2

-x^2 - 5x -6 ?