The answer to this equation would be 3.
Answer:
C. The statement is an equation because there is an equality symbol.
Step-by-step explanation:
Equation:
Combination of terms joined by the sign minus, plus, multiplication, and division and has equality sign.
Example
5x+45=-5
Term:
A Numbers. (Only)
Example:
9
Combination of a number and a variable joined by multiplication or division.
Example:
9x, 6ab, 10n
Variable:
a symbol that is written with a number or a term.
6ab
Expression:
Terms joined by the sign plus or minus
Hope this helps ;)❤❤❤
Answer:
30
Step-by-step explanation:
So we begin by assigning variables to each side with:
DE = x
EF = y
DF = z
Now we start listing a system of equations from what is given:
x+y+z=81
x=2y
x-4=z
Once we solve that with substitution, we get the result of:
x=34
y=17
z=30.
Since z is the length of DF, the length of DF is 30.
I hope this helped! :D
