The surface area of a cylinder is the sum of the top + bottom + body, right?
The top and the bottom are circles with the same radius 3.5 . And we know that the area of a circle is r^2pi, (don't forget we have 2 circle, so, the answer must be multiplied by 2)
Now, the body: the body is just a rectangular with the width is the height of the cylinder and the length is the circumference of the circle.
The circumference = 2 r pi
the height is given
All you need to do is to calculate them and add them up. You need to work out to get the answer.
It is systematic because they are going every tenth person, in a random manner.
Answer:
19
Step-by-step explanation:
if you do the checker method then you would find that
they add up to make a line which equals 180
so... the equation is (8x-7)+(x+16)=180
do the math and x=19
Divide the top number by the bottom number and multiply that by 100
i hope this helps
