Solve the problem.The area A of a circle with radius r is given by the formula A = ?r2. Find the radius of a circle with an area of 40 square meters. Use ? ? 3.14 and round to the nearest tenth when necessary.
A. 3.6 m
B. 11.2 m
C. 6.3 m
D. 12.7 m
Answer: A
Mathematics
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In a certain college, 33% of the physics majors belong to ethnic minorities. Find the probability of the event from a random sample of 10 students who are physics majors.Exactly 2 belong to an ethnic minority.
A. 0.0028 B. 0.1929 C. 0.2156 D. 0.1990
Mathematics
Translate to a system of two equations, then solve.How many liters of a 30% alcohol solution must be mixed with 40 liters of a 70% solution to get a 50% solution?
A. 8 L B. 4 L C. 80 L D. 40 L
Mathematics
Solve for x. Round to the nearest ten-thousandth.log (225x2) = 3.456
A. ± 1.0506 B. ± 3.5638 C. ± 161.3002 D. ± 12.7004
Mathematics
Find the derivative of y.y = ln (sinh 9x)
A. 9 csch 9x
B. 
C. 9 coth 9x
D. coth 9x
Mathematics