An airplane flying at an altitude of 10,000 feet passes directly over a fixed object on the ground. one minute later, the angle of depression of the object is 42°. approximate the speed of the airplane to the nearest mile per hour.

126 miles per hour

Step-by-step explanation:

We can draw a triangle and we can use trigonometry to write:

Where a is the distance plane flew in 1 minute

Since, 11,106.13 FEET in 1 MINUTE, to get in hours, we multiply by 60:

11,106.13 * 60 = 66,367.51 feet per hour

Now, to get in miles per hour, we divide by 5280 [5280 feet = 1 mi]

66,367.51 / 5280 = 126.21 miles per hour

To the nearest mph, it would be 126 miles per hour

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.