20 points and brainiest answer to the person that solves this

The answer to your question is:  17 years

Step-by-step explanation:

Data

Micaela's age = Sam's age + 2

In 4 years, Micaela's age + Sam's age = 40

Micaela = M

Sam = S

Equations

                    M = S + 2

                    M + S = 40

Solve the equations

                   S + 2 + S = 40

                  2S = 40 - 2

                  2S = 38

                  S = 38 / 2

                  S = 19 years old

                  M = 19 + 2

                  M = 21 years old, but this age is 4 years from now.

                                               The actual age is

                 M = 21 - 4

                 M = 17 years old

where's the diagrams?

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13