4

I’m not sure what the single "4" refers to. Do you want help with problem 4 from a set? Please share the full statement.

If you’d like, I can give you a quick 4-question practice set in a subject of your choice. For example:

• Calculus practice:

  1. Differentiate f(x) = x^3 sin x
  2. Differentiate y = (x^2)/(x+1)
  3. Find the critical points of f(x) = x^4 − 3x^3
  4. Evaluate the definite integral ∫ from 0 to 1 of (2x) cos x dx

• Linear algebra practice:

  1. Compute det[[2,1],[3,4]]
  2. Solve Ax = b for A = [[1,2],[3,4]], b = [5,6]
  3. Find eigenvalues of [[2,0],[0,3]]
  4. Determine if the vectors (1,0) and (1,1) are linearly independent

• Statistics practice:

  1. 95% CI for the mean with n=25, x̄=100, s=12
  2. If P(A)=0.5 and P(B)=0.6 with independence, P(A∩B)=?
  3. Compute standard deviation for data: 2, 4, 6, 8
  4. Hypothesis test: z-test for population mean with known sigma = 10, n=40, x̄=101

Tell me your subject and level (undergrad, intro/advanced), or paste the exact problem, and I’ll work through it step by step.