which of the following could be effectively used to reduce friction (a) water (b)petrol (c) kerosene (d) grease​

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.