Solve the problem.On a Touch Tone phone, each button produces a unique sound. The sound produced is the sum of two tones and is given by 
and y = sin (2?ht), where l and h are the low and high frequencies (in hertz = Hz) associated with that button. 
The tone produced is thus given by y = sin (2?lt) + sin (2?ht). Write an expression that models the tone by pressing the "9" button as a product of sines and cosines.
A. y = 2 sin (357?t) cos (2061?t)
B. y = 2 sin (2329?t) cos (625?t)
C. y = 2 sin (2061?t) cos (357?t)
D. y = 2 sin (625?t) cos (2329?t)
Answer: B
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Find the indicated probability. Round as indicated.Find the probability of at least 2 girls in 7 births. Assume that male and female births are equally likely and that the births are independent events. Estimate the probability to three decimal places if necessary.
A. 0.773 B. 0.938 C. 0.063 D. 0.164
Find the derivative of y with respect to x, t, or ?, as appropriate.y = ln 
A. ln 
B. 
C. 
D. 
Determine whether the statement is true or false.There are 35 prime numbers smaller than 150.
A. True B. False
Provide an appropriate response.Explain what happens when an integer is multiplied by 1, -1, and 0.
What will be an ideal response?