Professor dupré calc gives her class 20 study questions, from which she will select 8 to be on the final exam. how many ways can she select the questions?

Since order doesn't matter, then it's a combination of 8 chosen among 20:

20C₈ = (20!)/(20-8)!(8!) = 125,970 ways

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!