Solve the problem.A collection of dimes is arranged in a triangular array with 11 coins in the base row, 10 in the next, 9 in the next, and so forth with 1 dime in the last row. Find the value of the collection.
A. $13.20
B. $6.60
C. $3.30
D. $0.66
Answer: B
Mathematics
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Solve the problem.Find the derivative of the function 
at the point 
in the direction in which the function decreases most rapidly.
A. -24 B. -9 C. -8 D. -16
Mathematics
Solve the problem.Find the dimensions of a rectangle whose perimeter is 46 meters and whose area is 120 square meters.
A. 7 m by 14 m B. 9 m by 14 m C. 8 m by 15 m D. 7 m by 16 m
Mathematics
Express the number in scientific notation.0.0000004
A. 4 × 10-6 B. 4 × 10-8 C. 4 × 10-7 D. 4 × 10-9
Mathematics
Using the addition/subtraction method, find the value of x and y to satisfy the following equations: x + 2y = 4; 2x - 3y = 7
a. x = 15 y = 7/2 b. x = 60 y = 15 c. x = 7/13 y = 7/2 d. x = 31/7 y = 2/7 e. x = 26/7 y = 1/7
Mathematics