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gregori [183]
3 years ago
7

It's Jenny's birthday! She invites her three best friends Janey, Jeannie, and Joany

Mathematics
1 answer:
Luba_88 [7]3 years ago
8 0
The answer to this problem is 12.
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What is an equation of a parabola with a vertex at the origin and directrix x=4.75?
patriot [66]
An equation for the parabola would be y²=-19x.

Since we have x=4.75 for the directrix, this tells us that the parabola's axis of symmetry runs parallel to the x-axis.  This means we will use the standard form

(y-k)²=4p(x-h), where (h, k) is the vertex, (h+p, k) is the focus and x=h-p is the directrix.

Beginning with the directrix:

x=h-p=4.75
h-p=4.75

Since the vertex is at (0, 0), this means h=0 and k=0:

0-p=4.75
-p=4.75
p=-4.75

Substituting this into the standard form as well as our values for h and k we have:
(y-0)²=4(-4.75)(x-0)
y²=-19x
4 0
3 years ago
Water decomposes to produce hydrogen gas and oxygen gas. How many grams of water would be required to produce 10.0 moles of hydr
lesya692 [45]

Answer:

no se pregúntale a otro gracias cuidate mucho:)

6 0
3 years ago
Which statement best describes f(x)=-2√x-7+1
olga nikolaevna [1]

it is under mapping and function

f of x is equal to -2 root x-7 plus one

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A tank contains seven liters of 10% alcohol solution. how many liters of 6% alcohol should be added to have 8% alcohol solution?
kow [346]

Answer:

b

Step-by-step explanation:

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Two fifths of the children in the nursery were boys. What was the ratio of boys to girls in the nursery?
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