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Sphinxa [80]
3 years ago
10

WILL MARK BRAINLIEST PLEASE HELP

Mathematics
1 answer:
Marrrta [24]3 years ago
7 0

Answer:


f(x)=-\frac{1}{8}(x-4)^2+3

Step-by-step explanation:


The directrix given to us has equation,


y=5 and the focus is (4,1).  

This means that the axis of symmetry of the parabola is parallel to the y-axis and has equation x=4, because it must go through the focus.


This axis of symmetry of the parabola will meet the directrix at (4,5) .


The vertex of this parabola is the midpoint of the point of intersection of the axis of symmetry and the focus.


Thus,


V(h,k)=(\frac{4+4}{2},\frac{5+1}{2})


V(h,k)=(4,3).


The equation is given by (x-h)^2=4p(y-k).


(x-4)^2=4p(y-3).


|p| is the distance between the vertex and the focus, which is 2.


This implies that,


p=-2 or p=2


But the position of the directrix and the vertex implies that  the parabola opens downwards.

\therefore p=-2.


The equation of the parabola now becomes;


(x-4)^2=4(-2)(y-3).



(x-4)^2=-8(y-3)


We solve for y to obtain,


y=-\frac{1}{8}(x-4)^2+3


or


f(x)=-\frac{1}{8}(x-4)^2+3







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Step-by-step explanation:

let d = # of dimes and n = # of nickels

We know that Timmy has a total of 95 coins, consisting of dimes and nickels

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So 0.10d + 0.05n = $6.50

Note that we've just created a system of equations that we can solve

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There are many different methods we can use to solve this system but the easiest way in this situation is probably going to be the substitution method.

First we are going to want to rearrange the terms of the second equations so that one of the variables are defined.

d + n = 95

- subtract d from both sides -

n = 95 - d

We now defined "n"

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0.10d + 0.05(95 - d) = 6.50

we now solve for d

0.10d + 0.05(95 - d) = 6.50

step 1 distribute the 0.05

0.05 * 95 = 4.75 and 0.05 * -d = -0.05d

0.10d + 4.75 - 0.05d = 6.50

step 2 combine like terms 0.10d  - 0.05d = 0.05d

0.05d + 4.75 = 6.50

step 3 subtract 4.75 from both sides

0.05d = 1.75

step 4 divide both sides by 0.05

0.05d / 0.05 = d and 1.75 / 0.05 = 35

d = 35

Now that we have found the value of one variable we can plug it into one of the equations and solve for the other variable ( note that the equation that we use does not matter, we will acquire the same answer )

d + n = 95

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