In a survey of students, it was found that 50% of them like English, 60% like Maths and 40% like Science. If 20% like Maths and English, 15% like English and Science, 25% like Maths
and Science and 5% like all three subjects,
(1) What percentage of students like only two subjects ?
What percentage of students don't like any subject ?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)