The sixth-grade class at west side school starts a charity collection on monday, with $78 donated by the parents organization. they plan to add $2 to the fund each day .how much will they have after 90 days?

7,200 is your answer, hope this helps you.

$7,200
$78 + $2= $80
$80 times 90 days = $7,200

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!