The grade received on a certain teacher's 100-point test varies in direct proportion to the amount of time a student spends preparing for the test. if a student receives 72 points on a test for which she spent 3 hours preparing, what score would she receive on the next test if she spent 4 hours preparing?

Which of the following values are in the range is the function graphed below? check all that applya.3b.1c.0d.-2e.5f.2a

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!