- Bạn hãy chọn đáp án đúng. Cho tỉ lệ thức (x)/(5)=(y)/(4)=(z)/(6) và xyz=960. Khi đó: x+y+z=30 x+y+z=54 x+y+z=60 x+y+z=45
- Ascientist has a sample of bacteria that initially contains 20 million microbes They observe the sample and find that the number of bacterial microbes doubles every 15 minutes. Write an exponential function that represents M, the total number of bacterial microbes in millions, as a function of t, the number of minutes the sample has been observed? To write an exponential function M(t)=acdot b^x wenced to identify the initial amount, a:the base, b; and the time, 2. The initial amount: a = a=type your answer... The base: b = b=type your answer... The time: z: x=type your answer... The exponential function: type your answer. Example: If a=12,b=3,x=(4)/(t) the exponential function is M(t)=12^ast 3^wedge 4/t
- X is a random variable with mean/expected value E(X)=25.6 and variance VAR(X)=41 Consider the following random variables. A=2X B=2X-1 C=-1X+9 Answer parts (a) through (c) Part (a) Find the expected value and variance of A. E(A)=square (use two decimals) VAR(A)=square (use two decimals) Part (b) Find the expected value and variance of B E(B)=square (use two decimals) VAR(B)=square two decimals) Part (c) Find the expected value and standard deviation of C. E(C)=square (use two decimals) SD(C)=square (use two decimals)
- Solve the equation on the interval [0,2pi ) sec(3Theta )/(2)=2 What are the solutions to sec (3Theta )/(2)=2 in the interval [0,2pi ) Select the correct choice and fill in any answer boxes in your choice below. A. Theta =square (Simplify your answer. Type an exact answer, using pi as needed. Type your answer in radians. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) B. There is no solution.
- Question fo of 10 Northern Renaissance artists, unlike Italian Renaissance artists worked extensively with: A. Sculpture and pottery B. Engravings and woodcuts C. Portraits D. Frescoes
