The graph of a linear function is a straight line.
Answer the following statement true (T) or false (F)
True
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Solve the problem.The area A = ?r2 of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when 
A. 81? ft2/ft B. 9? ft2/ft C. 18 ft2/ft D. 18? ft2/ft
Find a Cartesian equation for the line whose polar equation is given.r cos
= 5
A. y = x - 5
B. y = x + 10
C. y = 
x - 10
D. y = x + 5
Solve the problem.There are 5 people in a club -- Cal, Elissa, Stephanie, Ken, and Pat. In how many ways can a President and a Treasurer be chosen for the club? (No person can hold both positions.)
A. 20 B. 24 C. 12 D. 10
An International Standard Book Number (ISBN) is used to identify books. The ISBN number for some book is 0-534-36890-5. The first digit, 0, indicates the book is published in an English-speaking country. The next three digits, 534, identify the publisher (Brooks/Cole) and the next five digits identify the particular book. The last digit is a check digit, which is used as follows. Multiply the first digit by 10, the next digit by 9, and so on:
?
10(0) + 9(5) + 8(3) + 7(4) + 6(3) + 5(6) + 4(8) + 3(9) + 2(0) + 1(5) = 209
?
This number is congruent to 0, (mod 11). This is not by chance. The check digit, 5, is chosen so that this sum is 0, (mod 11). In other words, the check digit x for the book with ISBN number 0-534-34015-x is found by considering:
?
10(0) + 9(5) + 8(3) + 7(4) + 6(3) + 5(4) + 4(0) + 3(1) + 2(5) = 148 ? 5
?
This means that for check digit x, 5 + x ? 0, (mod 11). The one-digit solution to this equation is x = 6, so the check digit is 6. What is the check digit for the book with ISBN 0-8028-1430-x?
?
A. 
B. ?
C. ?
D. ?
E. ?