It is never to rewrite an equation in standard form as a first step in solving it. true or false?

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

As a salesperson you get $50/day and $3.60/each sales you make.if you want to make $60 in one day, how many sales would you need need to make ? a 3b 4c 5d 6 show work.