A] <span>A remote-control airplane descends at a rate of 2 feet per second. After 3 seconds it is 67 feet above the ground. the point slope equation will be given as follows: y-y1=m(x-x1) where: slope,m=2 ft/sec (x1,y1)=(3,67) thus plugging in the values in the formula, we obtain the point slope equation as follow: y-67=2(x-3)
Answer: </span>y-67=2(x-3)
b]The height of the plane after 8 seconds will be: x=8 sec but: y-67=2(x-3) substituting x=8 we get: y-67=2(8-3) y-67=2(5) y=10+67 y=77 thus the height after 8 seconds is 77 ft
