Which equation is a related equation for this equation? 23/a=8
a. a+8=23
b. a=23/8
c. a=23*8
d. a=8/23

  An equation in mathematics is an equality which contains one or more variables.  Solving equations consist of determining which values of the unknowns make the equality true.  Variables are also called as unknowns. Solutions are values which satisfy the equality . Example:
Which equation is a related equation for this equation 23/a=8?
a.  a+8=23
b. a=23/8
c. a=23*8
d. a=8/23
The answer is letter b. a= 23/8.How do we get letter b?
Here's how: 

23/a = 8/1
8a/8= 23/8
(Cancel two 8s, both the numerator and denominator, a remains.) so,
a= 23/8  

You must find the surface of the block therefore 98187 dived by 5628 = 583m squared