9 is in parentheses therefore it's elevated above 3 that means you have to do operations on it first. 
3 + (-9) = -6
The sum is negative.
        
             
        
        
        
Answer:
Technician A is correct.
Step-by-step explanation:
Technician A says that a cylinder leakage test fills the cylinder with compressed air, and the gauge indicates the percentage of leakage. 
This is correct.
The cylinder leakage test is also called engine leak down test. Here rather than measuring the ability of engine to generate pressure, compressed air is filled in the cylinder via spark plug hole.
 
        
             
        
        
        
The answer is the option D because the formula is y upon x
        
             
        
        
        
Answer:
78.54 m^2
Step-by-step explanation:
The computation of the area of the circle is shown below:
As we know that
Area of the circle = πr^2
Also
Diameter = 2r
10 = 2r
r = 5
So, the area of the circle is 
=  3.14 × 5^2
= 78.54 m^2
 
        
             
        
        
        
Answer:
371 pounds
Step-by-step explanation:
First you find how much space is in the container
length is 13
width is 15
height is 10
2 * (15 * 13 + 10 * 13 + 10 * 15)= 950
The total space in the container is 950
Then multiply it by 0.39 to find the weight
950 * 0.39 = 370.5
Round to the nearest pound
.5 rounded is rounded to a whole number
371 pounds