read it carefuly
null hypothesis always have the word "not"
ex. tawa-tawa will not be effective in curing dengue
alternative hypothesis is always an "if-the statement"
ex. if pure tawa-tawa will not be effective in curing dengue then the researcher will add a teaspoon of salt blahblah
Because the opposite of 9 is -9. If you divide 54 by -9, the answer would be -6.
H-mass number is 1