Hannah is 1 year old today.
Step-by-step explanation:
Let,
Hannah = x
Biff = y
According to given statement;
y = x+25 Eqn 1
In four years;
y+4 = 6(x+4) Eqn 2
Putting value of y from Eqn 1 in Eqn 2;

Dividing both sides by 5

As x is age of Hannah, therefore,
Hannah is 1 year old today.
Keywords: linear equations, substitution method
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Answer:
420:8
Step-by-step explanation:
If 2 points lie in a plane, the line containing those opints lies in the same plane
Answer:
8
Step-by-step explanation:
3x is a varable and -1 is an integer