Under certain conditions, the pressure of a gas varies directly with the temperature. When the pressure is 800 psi, the temperature is 400 degrees. what is the temperature when the pressure is 450 psi?

Evaluate the expression. (9 + 5)(3 + 2)0

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.