You have been asked to select at least 3 out of 7 possible sites for oil exploration. designate each site as s1, s2, s3, s4, s5, s6, and s7. the restrictions are: restriction 1. evaluating sites s1 and s3 will prevent you from exploring site s7. restriction 2. evaluating sites s2 or s4 will prevent you from assessing site s5. restriction 3. of all the sites, at least 3 should be assessed. assuming that si is a binary variable, write the constraint(s) for the second restriction answer

a) s2 +s5 ≤ 1

b) s4 +s5 ≤ 1

c) s2 +s5 + s4 +s5 ≤ 2

d) s2 +s5 ≤ 1, s4 +s5 ≤ 1

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.