At maximum speed, an airplane travels
2100 miles against the wind in 6 hours.
Flying with the wind, the plane can
travel the same distance in 4 hours.
Let x be the maximum speed of the plane and y
be the speed of the wind. What is the speed of
the plane with no wind?
Enter the correct answer.

437.5 mph

Step-by-step explanation:

The first step is to convert these speeds into unit rates. 2100/6=350 miles per hour, and 2100/4=525 miles per hour. If you average these out, you will find the average speed of the plane without the wind. (525+350)/2=437.5 mph. Hope this helps!

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.