Answer:

Step-by-step explanation:
We have the cone and the half-sphere.
The formula of a volume of a cone:

r - radius
H - height
We have r = 7cm and H = (22-7)cm=15cm. Substitute:

The formula of a volume of a sphere:

R - radius
Therefore the formula of a volume of a half-sphere:

We have R = 7cm. Substitute:

The volume of the given shape:

Substitute:

 
        
             
        
        
        
The equivalent ratio of 9:25 is 36:100. 
Ratio expresses the degree of proportionality between two or more numbers. It expresses the number of times one number is contained in another number.  
In order to make the ratios equal, the relationship that exists between 9 and 36 has to be determined. 36 is a multiple of 9. It is 9 multiplied by 4. So, in order to make the ratios equal, multiply, 25 by 4. 
25 x 4 = 100
To learn more about ratios, please check: brainly.com/question/17995727
 
        
             
        
        
        
Answer:
5x+3>23
Step-by-step explanation:
x  4
4