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Answer:
<em>Sam is 30 years old, and Harry is 10 years old.</em>
Step-by-step explanation:
Let us assume that the age of Sam is x and the age of Harry is y.
Sam is currently is three times Harry's age.
So, ----------------------1
Sam's age is also 10 more than twice Harry's age.
so, ---------------2
Subtracting 2 from 1, we get
putting this in equation 1,
Therefore, Sam is 30 years old, and Harry is 10 years old.
Answer:
The turning point of a parabola is the vertex
Vertex form of a quadratic equation:
(where (h, k) is the vertex and a is the coefficient of the variable x²)
Given:
- vertex = (-1, 3)
Therefore, a = 1
Substituting a = 1 and the given vertex into the equation:
Therefore, a = 2 and b = 4