A+b=8
c+d=6
a+c=13
b+d=8
answer it?

 No Solution

Step-by-step explanation:

8 = A + B                                  13 =  A    +   C

6 =              C + D                      8 =        B   +    D

14 = A + B + C + D                     21 = A + B + C + D

The sum of A, B, C, and D cannot equal 14 and also 21 so there is

NO SOLUTION

for this case we have that by definition, the surface area of a cylinder is given by:

where:

r: it is the radius of the cylinder

h: it is the height of the cylinder

we can also rewrite it as:

where:

la: it's the lateral area

ba: area of the base

option a

8.75

how-to:

first, we need to find what we have to work with.

since i know that we have 7 (years) and 0.8 (inches), we can use these to solve and find the equation!

secondly, what you want to do, is see that we need to know how much growth out of the 0.8 inches he got in only 1 year, instead of 7 years.

let's try to divide.

7 ÷ 0.8 = 8.75