15 the formula for determining how long a hike will take is t=(d+h) , where d is the distance in miles and h is the elevation gain in thousands of feet. solve for h. a) h=2t−d b )h= c) h=t−d d) h=2d−t

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