x-y=21 ⇒ x=y+21
x+13=2y
Substitute y+21 for x into the equation x+13=2y
So y+21+13=2y
Simplify 34=y
So Danielle is 34 years old. Plug y back in to the original equation
x-34=21
x=55
Tony is 55 years old
Answer:
The value of f(3) = -2.
Step-by-step explanation:
First of all, let's find f(2).



Now, we can find f(3):


Therefore, the value of f(3) = -2.
I hope it helps you!
Answer:
The answer is 28
Step-by-step explanation:
Since the total measurements of triangle corners are equal to 180
Then
