How do you write 3 less than the product of 4 and -24

The mean average cost of standard room per night at a hostel is ? 20.60. therefore, how much does a standard room cost per night at night-time rest days?

Atriangle has side lengths of x, x+11, and 3x+5. what is the perimeter?

How many four digit even numbers can be formed from digits 1,2,3,4,5 if repetition is allowed. how can solve this using permutation formula