1/9 of total marbles = 1/9 × 36 = 4
so Alexis gave 4 marbles to Sara. 
And so Alexis is left behind with 32 (36-4) marbles and so Sara have 4 marbles now
        
                    
             
        
        
        
Answer:
the first one
Step-by-step explanation:
 
        
             
        
        
        
(3)(17.25) = 51.75; he spent $51.75
Because everything in the problem is positive, no negative numbers are needed.
        
                    
             
        
        
        
Answer:
18=2x
x=9
Step-by-step explanation:
hope it helps bro
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
<u>Surface Areas
</u>
Is the sum of all the lateral areas of a given solid. We need to compute the total surface area of the given prism. It has 5 sides, two of them are equal (top and bottom areas) and the rest are rectangles.
Computing the top and bottom areas. They form a right triangle whose legs are 4.5 mm and 6 mm. The area of both triangles is

The front area is a rectangle of dimensions 7.7 mm and 9 mm, thus

The back left area is another rectangle of 4.5 mm by 9 mm

Finally, the back right area is a rectangle of 6 mm by 9 mm

Thus, the total surface area of the prism is

