If m∠4 = (3x)° and m∠8 = (x + 40)°, what is the measure of ∠4? angles 4 and 8 being vertical.

Find the zero function by factoring (try to show work) h(x)=-x^2-6x-9

Me i'm timed right now! there's 4 answer

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean