Without graphing the function, determine its amplitude or period as requested.y = -3 cos 
xFind the amplitude.
A. 3
B. 4?
C. 
D. 
Answer: A
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Write the fraction in decimal notation.
A. 0.44 B. 0.5 C. 0.24 D. 0.36
Solve for y.7x + 9 = 5y - 9
A. y = 
B. y = 
C. y = 7x - 18
D. y = 7x + 18
Solve the problem.The inequality |T - 38| ? 17 describes the range of monthly average temperatures T in degrees Fahrenheit at a City X. (i) Solve the inequality. (ii) If the high and low monthly average temperatures satisfy equality, interpret the inequality.
A. 15 ? T; The monthly averages are always greater than or equal to 
B. 15 ? T ? 61; The monthly averages are always within 
C. 21 ? T ? 55; The monthly averages are always within 
D. T ? 55; The monthly averages are always less than or equal to 
Multiply the binomials.(-3x + 7)(-4x + 4)
A. -7x2 - 40x + 28 B. 12x2 - 40x + 28 C. -7x2 - 40x - 40 D. 12x2 - 40x - 40