Which expression calculates the speed in meters per second of an object that travels a distance of 40 m every 10 s?

40 ÷ 10

10 ÷ 40

40⋅10

40 + 10

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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.

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?