Which relation is a function?

{(9, –1), (–1, 9), (9, 2), (2, –1)}

{(5, –7), (4, 6), (–3, 8), (5, 9)}

{(8, –4), (–4, 8), (–4, –8), (–8, 4)}

{(2, 3), (–2, 3), (3, 2), (–3, –2)}

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Sara has been reading about different types of financial grants, including federal pell grants, academic competitiveness grants, smart grants, and teach grants. which statement about these grants is true? filling out a fafsa will not her apply for these grants. she will not have to pay back any funds she receives from these grants. these grants only go to students with less than a 3.0 gpa. she will have to pay back all the funds she receives from these grants.

Which strategy is used by public health to reduce the incidence of food poisoning?