We are trying to find the average speed of the plane, which is mph, or  . Using proportions, we can find the average speed of the plane in mph:
. Using proportions, we can find the average speed of the plane in mph:

- Use the information from the problem to create a proportion. Remember that we are looking for mph, so we will call that  . .

- Multiply the entire equation by  

- Divide both sides of the equation by  to clear both sides of the mile unit to clear both sides of the mile unit
The average speed of the plane is 300 mph.
 
        
             
        
        
        
Answer:
15 mph
Step-by-step explanation
i used a calculator but correct me if im wrong pls
 
        
             
        
        
        
Answer:
B and C
(I'm not sure if b and e are supposed to be the same though) if they are then, b, c, and e
 
        
                    
             
        
        
        
There are 12 inches in a foot, so 9ft = 108in. Also, 80% = 0.8. Therefore the formula is:
h(n) = 108 * 0.8^n.
To find the bounce height after 10 bounces, substitute n=10 into the equation:
h(n) = 108 * 0.8^10 = 11.60in (2.d.p.).
Finally to find how many bounces happen before the height is less than one inch, substitute h(n) = 1, then rearrage with logarithms to solve for the power, x:
108 * 0.8^x = 1;
0.8^x = 1/108;
Ln(0.8^x) = ln(1/108);
xln(0.8) = ln(1\108);
x = ln(1/108) / ln(0.8) = -4.682 / -0.223 = 21 bounces