Determine the integer needed to fill in the blank and make a true statement.(
)(
) = 
A. 4
B. 6
C. 
D. 
Answer: A
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Solve the problem.The sum of the squares of the digits of a positive two-digit number is 85, and the tens digit is 1 less than the units digit. Find the number.
A. 56 B. 65 C. 67 D. 76
Find the inverse of the matrix (if it exists).A = 
A. A-1 does not exist.
B. A-1 = 
C. A-1 =
D. A-1 = 
Give the domain and range of the relation.
A. domain: (-?, 0] ? [0, ?); range: (-?, -2] ? [-2, ?) B. domain: (-?, ?); range: (-?, ?) C. domain: (-?, 0) ? (0, ?); range: (-?, -2) ? (-2, ?) D. domain: (-?, -2) ? (-2, ?); range: (-?, 0) ? (0, ?)
Solve the problem.An airplane flies 450 miles with the wind and 330 against the wind in the same length of time. If the speed of the wind is 20, what is the speed of the airplane in still air?
A. 55 mph B. 120 mph C. 135 mph D. 130 mph