Can someone please help

5(1+2m)=1/2(8+20m)

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.