SAT Digital Diagnostic
Page 5 of 5 - Final Questions
Question 9
A survey of 200 high school students found that 120 students participate in a sport and 80 students participate in a club. If 40 of these students participate in both a sport and a club, how many students participate in neither?
Select the correct number of students:
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Question 10
x2 + y2 - 6x + 8y = 0
In the xy-plane, the graph of the given equation is a circle. What is the radius of the circle?
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Digital SAT Expert Tip: Equation of a Circle
The SAT frequently tests the standard equation of a circle: (x - h)2 + (y - k)2 = r2. If you are given the expanded form (like in Question 10), you must "complete the square" for both the x and y terms to find the radius squared on the right side of the equation. Don't forget to take the square root of that number to find r!