One airplane is approaching an airport from the north at 205 km/hr. A second airplane approaches from the east at 257. Find the rate at which the distance between the planes changes when the southbound plane is 27 km from the airport and the westbound plane is 19 km from the airport.

Astudy claims that the mean age of online dating service users is 40 years. some researchers think this is not accurate and want to show that the mean age is not 40 years. identify the null hypothesis, h0, and the alternative hypothesis, ha, in terms of the parameter μ. select the correct answer below: h0: μ≥40; ha: μ< 40 h0: μ≤40; ha: μ> 40 h0: μ≠40; ha: μ=40 h0: μ=40; ha: μ≠40