Answer:
I want to show you how to do this as well, the formula you are working with is a^2+b^2=c^2
Step-by-step explanation:
1.) 8^2+b^2=12^2
 64+b^2=144
subtract 64 from both sides
 b^2=80
take the square root of 80 and you get 
 b= 8.9
if you need more help on this let me know, I am going to list the other answers now because to do it all and show work on here is a lot of typing, all of which I will do if you do not understand the first example. Also the c value can ONLY BE THE HYPOTENUSE VALUE. The hypotenuse is the longest side of the triangle. For example, 12 would be the C value on number one and in number two it would be 15.
2.) 14.5
3.) 10.3
4.) 18.8
5.) 8
6.) 15
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Given that X the time to complete a standardized exam  in the BYU-Idaho Testing Center is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. 
We have 68 rule as 2/3 of total would lie within 1 std deviation, and 95 rule as nearly 95% lie within 2 std deviations from the mean.
We have std deviation = 10
Hence 2 std deviations from the mean 
= Mean ±2 std deviations
= ±20
±20
= 
Below 50, 0.25 or 2.5% would complete the exam.
 
        
             
        
        
        
Arithmetic sequence
Explanation
An arithmetic sequence is a list of numbers with a definite pattern. If you take any number in the sequence then subtract it by the previous one, and the result is always the same or constant then it is an arithmetic sequence
Step 1
Let


so, the difference is always the same, 2
Hence, the answer is a Arithmetic sequence
 
        
             
        
        
        
Answer:
There are 7 1/5 in 14/10
Step-by-step explanation:
say the unknown is x
1/5 x = 14/10
x = 14/10 × 5
x = 7
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
<u>The distance is:</u>
<u>Return trip will take:</u>
- 480/75 = 6.4 hours = 6 hours and 24 min