Solve the problem.The graph shows the hours studied and the exam grades obtained on a finite math exam for 8 students. (The two points on the line do not represent any of the eight students.) The line of best fit, the line graphed on the coordinate system, can be used to approximate the test grade the average student receives for the number of hours they study. 
Find the equation of the line of best fit. Then use the equation to estimate the number of hours studied by a student who received a grade of 78 . Round to two decimal places.
A. 4.71 hr
B. 4.24 hr
C. 2.23 hr
D. 3.21 hr
Answer: B
Mathematics
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Write the expression as the sum or difference of multiples of logarithms.logb 
A. 
logb x + 
- 2 logb y - 4 logb z
B. 
(logb x3 + logb b5 - logb y8 + logb z16)
C. 
logb x + 5 - 8 logb y - 16 logb z
D. 
logb x + 
- 2 logb y + 4 logb z
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Determine if the graph represents a function.
A. Yes B. No
Mathematics
Find all the real zeros of the polynomial. Use the quadratic formula if necessary.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
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Solve for the indicated letter.Solve S = x2 + y2 - 8x + 10y - 4 for x.
A. x = 4 ± 
B. x = 4 ± 
C. x = 4 ± 
D. x = 4 ± 
Mathematics