D=20-1.95c how would i work this out correctly

Umm is D represented by a number?

if it was, you would take D=20-1.95c subtract 20 from both sides, so you can isolate your variable, c

then divide both sides by -1.95 and you get

( D - 20 ) ÷ -1.95 = c

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.

If you make it a little more clear i can answer it