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natima [27]
4 years ago
8

What is the value of h when the function is converted to vertex form?

Mathematics
1 answer:
larisa86 [58]4 years ago
4 0
H=7

To convert this to vertex form, we must complete the square.  This equation is in the form f(x)=ax²+bx+c.  To complete the square we take half of b and square it:
(-14/2)²=(-7)²=49

This tells us what to add to the function.  We must also subtract it from the function, however, in order to preserve equality:
p(x) = x²-14x+49+29-49
p(x) = (x-7)²-20

Now that it is in vertex form, we can see that the value of h is 7.
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Answer:

Unknown weight is 11.5kg.


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Round weight is 2.5kg. 2×4+2×2.5=13.

Left pan is 4+3×2.5=4+7.5=11.5.

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What is 3 times sqrt 18
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The answer is 9600

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A class of 34 students elected a class secretary.
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The population of mosquitoes in a certain area as a function of inches of rainfall is modeled in the table. The function is quad
torisob [31]

Answer:

The x-intercept represents that after 10  in. of rain there are mosquitoes.

                        Or

The x-intercept represents that after 0 in. of rain there are no mosquitoes.

Step-by-step explanation:

We are given a table that represents the population of mosquitoes in a certain area as a function of inches of rainfall :

RAINFALL(in.)     POPULATION (millions.)

     0                               0

      1                                9

      3                              21

      4                              24

      5                              25

      6                              24

We will first find the function P(t) which denotes the number of mosquitoes after t inches of rainfall.

As the function is quadratic.

Hence , let:

P(t)=at^2+bt+c

At t=0 we have, P(t)=0

c=0

at t=1 we have: P(t)=9

i.e.

a+b=9-----(1)

Also at t=2 we have: P(t)=21

i.e.

9a+3b=21-------(2)

On solving equation (1) and (2) we get:

a= -1 and b=10

Hence,

P(t)=-t^2+10t

We know that the x-intercept of a graph is a point where the y-value is zero.

i.e. it is the inches of rainfall when the population of mosquitoes is zero i.e. there are no mosquitoes.

i.e. we have to find t such that:

P(t)=0

i.e.

-t^2+10t=0\\\\i.e.\\\\t(10-t)=0\\\\i.e.\\\\ t=0\ or\ t=10

Hence, we have got two x-intercept.

one at t=0 and the other at t=10.

The x-intercept represents that after 10 in. of rain there are no mosquitoes.

         Or

The x-intercept represents that after 0 in. of rain there are no mosquitoes.

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4 years ago
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