If and , find a formula for

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?



A. 0
B.
C.
D.

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Answer: C

Mathematics

Identify the specified numbers.The rational numbers in the following list:1, , -12, 0, , , 0.78

A. 1, -12, 0, 
B.
C. 1, -12, 0, , 
D. 1, -12, 0, , , 0.78

Find the infinite sum accurate to three decimal places.

A. 0.143 B. 0.800 C. -0.571 D. 0.200

Solve the given differential equation.D4y + 18 D2y + 81y = 0

A. y = c1 sin 3x + c2 cos 3x B. y = (c1 + c2x)sin 3x + (c3 + c4x)cos 3x C. y = (c1 + c2x)sin x + (c3 + c4x)cos x D. y = (c1 + c2x)sin 3x + (c3 + c4x)ex

Answer the question(s) based on the following situation: For a population of 4000 students taking the SAT math exam, the scores on the exam have an approximately normal distribution with mean ? = 610 and standard deviation ? = 60.Approximately how many students scored below 730 points?

A. 3000 B. 3900 C. 3800 D. 2720 E. none of these