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Vsevolod [243]
3 years ago
15

Which is the equation of an ellipse centered at the origin with foci on x-axis, x-intercepts +7, -7 and y-intercepts +2,

Mathematics
1 answer:
Aleks04 [339]3 years ago
7 0
We know that
<span>foci on x-axis-------> is a ellipse with horizontal major axis

the equation is
(x</span>²/a²)+(y²/b²)=1

major axis is th<span>e </span>x<span>-axis with length </span><span>2<span>a
2a=14--------> a=7

</span></span>minor axis is the y<span>-axis with length </span><span>2<span>b
2b=4-----> b=2

the equation is
</span></span>(x²/a²)+(y²/b²)=1------> (x²/7²)+(y²/2²)=1-----> (x²/49)+(y²/4)=1

the answer is
(x²/49)+(y²/4)=1

see the attached figure

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According to the 2010 U.S. Census, there are approximately 8 million people living in Virginia. This is 2.8 million less than 4
grandymaker [24]

Solution: We are given that the population of Virginia is 8 million.

Let x be the population of Nevada.

We are given population of Virginia is 2.8 million less than 4 times the population of Nevada.

\therefore 4x-2.8=8

      4x=8+2.8

      4x=10.8

      x=\frac{10.8}{4} =2.7

The first step is to on both sides.

add 2.8

The second step is to on both sides.

divide 4

The population of Nevada is million.

2.7

8 0
3 years ago
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There are 5 red marbles, 2 Green marbles and 3 black marbles. What is the probability that red or black is chosen?(answer in dec
ANEK [815]

Answer:

.8

Step-by-step explanation:

5 red marbles, 2 Green marbles and 3 black marbles = 10 marbles

P (red or black) = number of red or black/ total

                          = (5+3)/10

                          =8/10

   decimal form  = .8

5 0
3 years ago
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How do you do solve this problem
Damm [24]

Answer:

<h2>186 : 1</h2>

Step-by-step explanation:

1cm = 10mm

Therefore 8cm = 8 · 10mm = 80mm

The scale of the model

\dfrac{model}{real}\to\dfrac{80}{0.43}=\dfrac{80\cdot100}{0.43\cdot100}=\dfrac{8000}{43}\approx186

8 0
3 years ago
Two storage sheds are to have the same area. One is square and one is rectangular. The rectangular shed is 4 meters wide and 9 m
aliina [53]
Area is calculated by taking the length times the width.
A=lxw

one shed is 9 x 4 =36 square feet.
the other shed will be the same but have a four sides equal.
a shed with side of 6 x 6 will have a area of 36 square feet.

one side of the square shed would be 6 feet.

brainliest is always appreciated..
6 0
3 years ago
Simplify the expression (62)4
Inessa [10]

Answer:

248

Step-by-step explanation:

(62)4

= 62 x 4

= 248

5 0
3 years ago
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