Find the value of each variable.
A. a=15, b=5, c=8, d=4
B. a=15, b=4, c=8, d=5
C. a=14.5, b=5, c=6, d=4
D. a=14.5, b=4, c=6, d=5

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.