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Sunny_sXe [5.5K]
3 years ago
7

Which quadratic function has Vertex (-1,4) and passes through (4,19) HELP

Mathematics
1 answer:
hichkok12 [17]3 years ago
6 0

Answer:

f(x)=\frac{3}{5}(x+1)^2+4

Step-by-step explanation:

The equation of a quadratic function in vertex form is given by:

f(x)=a(x-h)^2+k

Where (h,k) is the vertex.

It was given in the question that the vertex of the parabola is (-1,4).

When we substitute the vertex into the formula we get:

f(x)=a(x+1)^2+4

The parabola also passes through (4,19) hence it must satisfy its equation.

19=a(4+1)^2+4

19-4=a(5)^2

15=25a

We divide both sides by 25 to get:

a=\frac{15}{25}= \frac{3}{5}

Hence the quadratic function is:

f(x)=\frac{3}{5}(x+1)^2+4

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A steam engine for pulling trains has wheels of diameter 1.5 metres.
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Answer:

The wheel completed a total of 212 turns.

Step-by-step explanation:

A wheel has a circular form, therefore its length is given by the following formula:

length = 2*\pi*radius

Where radius is half the diameter. Applying the data from the problem to calculate the length of the wheel gives us:

length = 2*\pi*(\frac{1.5}{2})\\length = 1.5*\pi = 4.7124

Since the engine traveled a distance of 1000 metres and each turn of the wheel has 4.7124 metres, in order to calculate the number of turns the wheel made in that course we need to divide both numbers as shown below:

turns = \frac{1000}{4.7124} = 212.21

The wheel completed a total of 212 turns.

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3 years ago
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5(3x-6) is equivalent to 15x - 30 if they are equivalent if the two values are the same.

<h3>What is expression?</h3>

An expression is a set of terms combined using the operations +, – , x or , /.

Given expression:

5(3x-6) is equivalent to 15x - 30.

If we put x=2 in both expression, we get finite value.

To check both the expression are equal or not we have to solve by putting the value.

So,

They are equivalent if the two values are the same otherwise not.

Learn more about expression here:

brainly.com/question/13947055

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