What is the equivalent fraction of 2.8?

2.8/1 times the top and bottom by 10
You get 28/10. If you divide 28 by 10, 10 goes into 28 2 times with a remainder of 8. 
The 2 becomes the number and the remainder becomes the numerator whilst 10 becomes the denominator resulting in 2 and 8 tenths(8/10). Simplify the 8 tenths by dividing 2 top and bottom to get 4/5, therefore your answer is 2 and 4/5. 

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!