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:
n=7 d=8
Step-by-step explanation:
n+d=15 d=15-n
0.05n+0.1(15-n)=1.15
0.05n-0.1n+1.5=1.15
-0.05n=-0.35
n=7 d=8
Answer:
PI is part of the formula for the circumference.
Step-by-step explanation:
The formula is c=2π
r.
Hope it helps!
35 = 1/2h (6+1)
35 = 1/2 h + 7
28 = 1/2h
14 = 1h
14 = h