What is the property to (6+x)+(5+n)=6+(x+5)+n

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

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.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6