Solve the problem.An average score of 90 for 5 exams is needed for a final grade of A. John's first 4 exam grades are 79, 89, 97, and 95. Determine the minimum grade John needs on the fifth exam to get an A in the course.
A. 95
B. 85
C. 100
D. 90
Answer: D
Mathematics
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Estimate the sum as indicated. Then answer the question.Estimate the following sum by first rounding to the nearest hundred. Does the estimate give you reason to doubt the stated sum?
A. Estimate: 126,200 ; no B. Estimate: 138,200 ; no C. Estimate: 126,200 ; yes D. Estimate: 138,200 ; yes
Mathematics
Replace the Cartesian equation with an equivalent polar equation.xy = 1
A. 2r2 sin ? cos ? = 1 B. r2 sin 2? = 2 C. r sin 2? = 2 D. 2r sin ? cos ? = 1
Mathematics
Solve the logarithmic equation.ln x - ln (x - 6) = ln 8
A. 2
B. 
C. 
D. No solution
Mathematics
Perform the indicated operation. Write the answer in simplest form. If the answer is an improper fraction, write it as a mixed number.3
? 2
A. 9
B. 9
C. 65
D. 2
Mathematics