Flying to Tahiti with a tailwind a plane averaged 259 km/h. On the return trip the plane only averaged 211 km/h while flying back into the same wind. Find the speed of the wind and the
speed of the plane in still air.

Let assume that the speed of plane is x

whereas, The speed of the wind is y

According to the first condition

That is,

Speed of plane + Speed of wind = 259 km/h

Subsitute the required variables,

That is,

Speed of plane - Speed of wind = 211 km/h

Subsitute eq(1) in eq( 2 ) :-

Thus, The speed of wind that is y is 24 km/h

Subsitute the value of y in eq(1) :-

Hence, The speed of the wind and the plane in still is air are 24km/h and 235km/h .

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,