Use the at least once rule to find the indicated probability.An unprepared student makes random guesses on all questions of her multiple choice test. If there are 19 questions and each question has 5 possible answers, what is the probability she will answer at least one question correctly?
A. 0.969
B. 0.004
C. 0.986
D. 0.014
Answer: C
Mathematics
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Solve the problem.Find the dimensions that produce the maximum floor area for a one-story house that is rectangular in shape and has a perimeter of 122 ft. Round to the nearest hundredth, if necessary.
A. 61 ft × 61 ft B. 10.17 ft × 30.5 ft C. 30.5 ft × 30.5 ft D. 30.5 ft × 122 ft
Mathematics
The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).x2 = 4y
A. 4 sin2 ? = r cos ? B. 4 cos2 ? = r sin ? C. r sin2 ? = 4 cos ? D. r cos2 ? = 4 sin ?
Mathematics
Find the product AB, if possible.A = 
, B = 
A. 
B. 
C. AB is not defined.
D. 
Mathematics
Find.sin (cos-1 x)
A. x
B. 
C. 
D. 
Mathematics