I didn’t understand how to solve this, i’d be happy if someone explained thank you

Option (E)

Step-by-step explanation:

------(1)

-------(2)

Since,

By substituting the values of b and d from equation (1) and (2),

6a + 24 = 6a + mc

mc = 24

m =

Therefore, Option (E) will be the correct option.

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.