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dem82 [27]
3 years ago
9

The Kentucky Derby distance is 20 furlongs. How far is the Kentucky Derby in​ rods and fathoms?

Mathematics
1 answer:
Leona [35]3 years ago
3 0

Answer:

The distance is equivalent to 800 rods and 2200 fathoms.

Step-by-step explanation:

Given:

The distance of the Kentucky Derby in furlongs is 20 furlongs.

Now, in order to convert the distance in rods and fathoms, we use the conversion factor for each.

We know that,

1 furlong = 40 rods.

Therefore, the conversion factor is \frac{40\ rods}{1\ furlong}

So, 20 furlongs is equivalent to rods =20\ furlongs\times \frac{40\ rods}{1\ furlong}=800\ rods

Therefore, 20 furlongs is equivalent to 800 rods.

Now, we also know that,

1 furlong = 110 fathoms

So, the conversion factor is \frac{110\ fathoms}{1\ furlong}

So, 20 furlongs is equivalent to rods =20\ furlongs\times \frac{110\ fathoms}{1\ furlong}=2200\ fathoms

Therefore, 20 furlongs is equivalent to 2200 fathoms.

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Ten times an integer is added to seven times it’s square. If the result is 152, what was the original number?
Bess [88]

Answer:

Required number is 4.

Step-by-step explanation:

Let the required number be a.

Given,

Sum of ten times the integer and seven times it’s square is 152.

= > Ten times of a + seven times of it's square = 152

= > 10( a ) + 7( a )^2 = 152

= > 10a + 7a^2 - 152 = 0

= > 7a^2 + 10a - 152 = 0

= > 7a^2 + ( 38 - 28 )a - 152 = 0

= > 7a^2 + 38a - 28a - 152 = 0

= > a( 7a + 38 ) - 4( 7a + 38 ) = 0

= > ( a - 4 )( 7a + 38 ) = 0

= > a = 4 or - 38 / 7

Hence the required number is 4.

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3 years ago
Lisa and her brother went tothe town carnival.Together they won 15 prizes.lisa won 9 of them.what fraction did her brother win?
antiseptic1488 [7]
6/15 b/c 9-15=6; 1/2 b/c 5/10=1/2
7 0
4 years ago
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______are loans to a company or government for a set amount of time they earn interest in are considered low-risk Investments
Citrus2011 [14]
I think the answer is B
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3 years ago
Cos^2 x+4sin^2 x/2=1
lana [24]

Let\ \dfrac{x}{2}=a,\ therefore\ x=2a.\\\\\cos^2x+4\sin^2\dfrac{x}{2}=\cos^22a+4\sin^2a\\\\\text{use}\ \cos2x=\sin^2x-\cos^2x\\\\=(\sin^2a-\cos^2a)^2+4\sin^2a\\\\\text{use}\ (a-b)^2=a^2-2ab+b^2\\\\=(\sin^2a)^2-2(\sin^2a)(\cos^2a)+(\cos^2a)^2+4\sin^2a\\\\=\sin^4a-2\sin^2a\cos^2a+\cos^4a+4\sin^2a\\\\=\underbrace{\sin^4a+2\sin^2a\cos^2a+\cos^4a}_{(*)}-4\sin^2a\cos^2a+4\sin^2a\\\\\text{use}\ (*)\qquad(a+b)^2=a^2+2ab+b^2

=\underbrace{(\sin^2a)^2+2\sin^2a\cos^2a+(\cos^2a)^2}_{(*)}-4\sin^2a(\cos^2a-1)\\\\=(\sin^2a+\cos^2a)^2-4\sin^2a(\cos^2a-1)\\\\\text{use}\ \sin^2a+\cos^2a=1\to\sin^2a=\cos^2a-1\\\\=1^2-4\sin^2a(\sin^2a)=1-4\sin^4a=1-(2\sin^2a)^2

\cos^22a+4\sin^2a=1\\\\1-(2\sin^2a)^2=1\qquad\text{subtract 1 from both sides}\\\\-(2\sin^2a)^2=0\to2\sin^2a=0\qquad\text{divide both sides by 2}\\\\\sin^2a=0\to\sin a=0\\\\a=k\pi\ for\ k\in\mathbb{Z}\\\\\dfrac{x}{2}=k\pi\qquad\text{multiply both sides by 2}\\\\\boxed{x=2k\pi\ for\ k\in\mathbb{Z}}

6 0
3 years ago
Write the standard equation of the circle with center (-14, -3) that passes through the point (-5,3),
grin007 [14]

Answer:

(x + 14)^2 + (y + 3)^2 = 117

Step-by-step explanation:

Equation of a circle:

The equation of a circle with center (x_0,y_0) is given by:

(x - x_0)^2 + (y - y_0)^2 = r^2

In which r is the radius.

Center (-14, -3)

This means that x_0 = -14, y_0 = -3

So

(x - x_0)^2 + (y - y_0)^2 = r^2

(x - (-14))^2 + (y - (-3))^2 = r^2

(x + 14)^2 + (y + 3)^2 = r^2

Passes through the point (-5,3),

This means that when x = -5, y = 3. We use this to find the radius squared. So

(x + 14)^2 + (y + 3)^2 = r^2

(-5 + 14)^2 + (3 + 3)^2 = r^2

r^2 = 117

So, the equation of the circle is:

(x + 14)^2 + (y + 3)^2 = r^2

(x + 14)^2 + (y + 3)^2 = 117

6 0
3 years ago
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