No.3
U should search it bc there's so many sites can help u just search inequality calculator
 
        
        
        
Answer:
9+20t
Step-by-step explanation:
Look at the terms and see which has t and which is a number when you see like terms, add them or subtract them together to get like terms.
 
        
             
        
        
        
The equation of parabola is  . If a is positive and
. If a is positive and  is always greater than zero or equal to zero, then x is also greater or equal to zero. This means that parabola is determined for non-negative x and for all real y.
 is always greater than zero or equal to zero, then x is also greater or equal to zero. This means that parabola is determined for non-negative x and for all real y.
Tha canonical equation of parabola is  , where p>0. The branches of this parabola go up in positive y-direction. When you change x to y and y to x, then the branches of parabola go in positive x-direction, that is right.
, where p>0. The branches of this parabola go up in positive y-direction. When you change x to y and y to x, then the branches of parabola go in positive x-direction, that is right.
Answer: correct choice is A. 
 
        
             
        
        
        
Answer:
The rate at which the distance from the plane to the station is increasing is 331 miles per hour.
Step-by-step explanation:
We can find the rate at which the distance from the plane to the station is increasing by imaging the formation of a right triangle with the following dimensions:
a: is one side of the triangle = altitude of the plane = 3 miles
b: is the other side of the triangle = the distance traveled by the plane when it is 4 miles away from the station and an altitude of 3 miles 
h: is the hypotenuse of the triangle = distance between the plane and the station = 4 miles                     
First, we need to find b:     
 (1)
   (1)     

Now, to find the rate we need to find the derivative of equation (1) with respect to time:
 
 
 
 
Since "da/dt" is constant (the altitude of the plane does not change with time), we have:   
 
 
And knowing that the plane is moving at a speed of 500 mi/h (db/dt):
 
 
 
   
Therefore, the rate at which the distance from the plane to the station is increasing is 331 miles per hour.
I hope it helps you!