Please help! NO LINKS! (Scientific Notation)

** Only answer if you actually know it, please

Ill mark the brainliest if you me with the these three questions 7,8,9

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

Is there a direction u in which the rate of change of f(x, y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.