Express the statement as an equation involving the indicated variables.The circumference C of a circle is the product of ? and its diameter d.
A. C = 
B. C = ? + d
C. C = 2?d
D. C = ?d
Answer: D
Mathematics
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Use quadratic regression to model the following data. Round your answers to two decimal places, if necessary. x 2.13 3.45 4.76 6.18 8.22 y 3.64 5.82 9.16 7.32 3.19?
A. ?
B. ?
C. 
D. ?
Mathematics
Find the discount period.Loan made: Sep 12Length of loan: 320 daysDate of discount: Mar 3
A. 151 days B. 169 days C. 172 days D. 148 days
Mathematics
Find the average of the set of numbers.
and 
A. 
B. 
C. 
D. 
Mathematics
Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
and 
A. Yes B. No
Mathematics