Miss Chen said she had 1152 file folders in the four boxes on her desk Maria used the expression 1152÷4 to determine how many file folders were in each box

Ais the answer for your question

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!

than do 23.50 times 18 and then divide your answer by 100 than you will get x.

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction