Giải bằng phương pháp bài toán M: Min f(x) = 4x1 + 5x2 - 2x3

x1 + x2 + x3 ≤ 6
2x1 + 3x2 - x3 = 1
x1 + 2x2 - x3 = 0
x1; x2; x3 ≥ 0:

Cot(90° − x) = 1 the value of x that satisfies this equation is °. a. 60 b. 135 c. 225 d. 315

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function.a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2