Answer:
y = -1/4x + 4
Step-by-step explanation:
y2-y1/x2-x1
The two triangular ends have area (3 cm)*(4 cm) = 12 cm^2, so the area of the rectangular faces is (204 -12) cm^2 = 192 cm^2. The sum of lengths of those rectangular faces is (3 cm +4 cm +5 cm) = 12 cm, so the width is given by
.. 192 cm^2 = (12 cm)*x
.. (192 cm^2)/(12 cm) = 16 cm = x
The 2nd selection is appropriate.
Answer:
x = 11
Step-by-step explanation:
If a radius bisects a chord ( as in the lower chord )then it is perpendicular to the chord.
Thus both chords are equidistant from the centre ( both 12 ) and are therefore congruent.
Hence x = 11
The surface area of a right cylinder equals 
As you can see in the attached picture, the surface area consists of two equal circles (bottom and top one) and area that would look like a rectangle, if "unraveled".
The formulae for the surface area of the circle is 
. You have to multiply it by two and add to the area of the "rectangle", which equals
where

is the circumference of the circle and

is the height of the cylinder.