Answer:
Step-by-step explanation:
cross multiply
50x=156.25×16
50x=2500
X=50
The formula for the surface area of a cylinder is:

Plug in what we know, use 3.14 to approximate for pi(radius is half the diameter, 30/2 = 15):

Simplify:

Subtract 1413 to both sides:

Divide 94.2 to both sides:

So the height is approximately 45 millimeters.
Answer:
The intercepts 
Step-by-step explanation:
Given:

Required
Determine the intercepts
The equation is a linear equation and the intercepts of the equation is calculated as thus;
For x intercepts; substitute 0 for y




Add 1 to both sides


Divide both sides by 4


Simplify fraction to lowest term

For y intercept, substitute 0 for x




Subtract 5 from both sides


Divide both sides by 3


Reorder

Hence, the intercepts 
The external angle between the secants (20°) is half the difference of the intercepted arcs.
(75° - B)/2 = 20°
75° - B = 40°
75° - 40° = B = 35°
Answer:
9
Step-by-step explanation:
3^3 is 27 so
27·27/3^4
3^4 is 81 so
27·27/81
27·27 is 729 so
729/81
729÷81 is 9