Answer:
2(x+5)
Step-by-step explanation:
 
        
             
        
        
        

If 2x+y=5, then y=5-2x, so he substituted 5-2x correctly.
x+4x=5x, so he combined like terms correctly.
If 5x-10=10, then 5x=10+10 -> 5x=20, so he subtracted 10 from the right side instead of adding 10 to the right side.
The answer is C.
Here's the correct solution:
 
 
        
             
        
        
        
Is it a right triangle?? If so use the Pythagorean theorem (a2+b2=c2) 
        
                    
             
        
        
        
Answer:
1282.81824016
Step-by-step explanation:
Find the volume of the cone (the formula is π×r²×h/3) and the volume is 359.19
Now find the volume of the cylinder which is 923.6282401554 and we just add them together which is 1282.81824016
 
        
                    
             
        
        
        
Answer:
68
Step-by-step explanation:
We let the random variable X denote the height of students of the college. Therefore, X is normally distributed with a mean of 175 cm and a standard deviation of 5 centimeters.
We are required to determine the percent of students who are between 170 centimeters and 180 centimeters in height.
This can be expressed as;
P(170<X<180)
This can be evaluated in Stat-Crunch using the following steps;
In stat crunch, click Stat then Calculators and select Normal
In the pop-up window that appears click Between
Input the value of the mean as 175 and that of the standard deviation as 5
Then input the values 170 and 180
click compute
Stat-Crunch returns a probability of approximately 68%