The surface area, A, of a cylinder is given by the formula A = 2ttrh + 2tr2, where ris the radius and h is the height
of the cylinder
What is the surface area of a cylinder with a height of 5 and a radius of 2?
A. 2811
B. 351
C. 4211
D. 70
E. 7511

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

answer: the answer is b. i think hope i got it correct

step-by-step explanation:

none of these

step-by-step explanation:

23 + 34 add up to 57 so just inform the teacher of this really stupid mistake