To solve this we need only substitute values of u and w, and then calculate.
<span>u+5v-w = 6 + 5v - 9 = 5v +6 - 9 = 5v - 3</span>
        
             
        
        
        
The geometric sequence would be multiplying by 3
        
                    
             
        
        
        
Angle A = 3x - 10
Angle B = x 
Their angle sum = 90° ( complementary angles form 90° ) 
This can be written in an equation as =
= 3x - 10 + x = 90
= 3x + × + ( -10 ) = 90 
= 4x + (-10) = 90
= 4x = 90 + 10 ( transposing-10 from LHS to RHS changes-10 to +10 )
= 4x = 100 
= x = 100 ÷ 4 ( transposing ×4 from LHS to RHS changes ×4 to ÷4 )
= x = 25 
Angle A = 3x - 10 
= 3 × 25 - 10 
= 75 - 10 
= Angle A = 65° 
Angle B = x = 25° 
Their sum = 65 + 25 = 90° 
Therefore , the complementary angles , Angle A = 65° and Angle B = 25° .
 
        
             
        
        
        
check the picture below, that's pretty much the same block, or "rectangular prism", with a width of 10, length of 5 and height of 1.
so anyhow, is really 6 rectangles stacked up to each other at the edges, so, we can simply get the area of each of those rectangles, add them up and that's the surface area.
front and back, two rectangles of  5x1
left and right, two rectangles of 1x10
top and bottom, two rectangles of 10x5

 
        
             
        
        
        
The least-square regression line has a slope of:
m=(nΣxy-ΣyΣx)/(nΣx²-ΣxΣx)
and a y-intercept of:
b=(Σy-mΣx)/n
In this case: n=7, Σxy=4899, Σy=391, Σx=85, Σx²=1153 so
m=(7(4899)-391*85)/(7(1153)-85*85))=1058/846
b=(391*846-85*1058)/(7*846)=34408/846
So the line of best fit is:
y=(1058x+34408)/846  and if we approximated this as your answers see to have done....
y=1.25x+40.67