The difference of the square of a number and 28 is equal to 3 times that number. Find the negative solution

The table shows the distance traveled over time while traveling at a constant speed.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

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.