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son4ous [18]
3 years ago
13

URGENT HELP NEED!!! I WILL REWARD LOTS OF POINTS FOR THIS QUESTION!!! ANY IRRALEVENT OR SILLY QUESTION WILL BE INSTANTLY REPORTE

D!!!! THANK YOU!!!!!
A yacht race follows a triangle course that has been mapped on to a Cartesian plane. The scale on the axes indicates distances in kilometres. The race begins and ends at the origin?
a. Calculate the length of each leg of the race?
b. Calculate the total racing distance?
c. If an observer’s boat is located at the midpoint of the second leg of the race, calculate the distance between this boat and the finishing point?

Mathematics
2 answers:
Ipatiy [6.2K]3 years ago
5 0

Let the points be A,B,C

  • A(0,0)
  • B(24,16)
  • C(8,20)

#A

\\ \bull\sf\leadsto AB=\sqrt{(24-0)^2+(16-0)^2}=\sqrt{24^2-16^2}=\sqrt{576-256}=\sqrt{320}=17.4units(leg3)

\\ \bull\sf\leadsto AC=\sqrt{(8-0)^2+(20-0)^2}=\sqrt{8^2+20^2}=\sqrt{64+400}=\sqrt{464}=21.4units(leg1)

\\ \bull\sf\leadsto BC=\sqrt{(24-8)^2+(26-20)^2}=\sqrt{16^2+(-4)^2}=\sqrt{256+16}=\sqrt{272}=16.4units(leg2)

#B

We have to find perimeter

\\ \bull\sf\leadsto Perimeter=AB+AC+BC

\\ \bull\sf\leadsto Periemter=17.4+16.4+21.4

\\ \bull\sf\leadsto Perimeter=55.2units

#C

The length of leg3=17.4units

Nimfa-mama [501]3 years ago
3 0

Answer:

Solution given;

points be A,B,C

P(0,0)

Q(24,16)

R(8,20)

a. Calculate the length of each leg of the race?

each leg's length

By using distance formula we can find length

I.e. d=\sqrt{(x_2- x_1)²+(y_2-y1)²}

<u>leg 1</u>

PR

=\sqrt{(8-0)²+(20-0)²}=\sqrt{464}=4\sqrt{29}

<u>=21.54</u><u> </u><u>km</u>

<u>leg 2</u>

QR

\sqrt{(8-24)²+(20-16)²}=\sqrt{272}=4\sqrt{17}

=<u>16.49 </u><u>km</u>

<u>leg 3</u>

PQ

=\sqrt{(24-0)²+(16-0)²}=\sqrt{832}=8\sqrt{13}

=<u>28.84 </u><u>km</u>

b. Calculate the total racing distance?

<u>The total racing distance</u>=Sum of all side

=PR+QR+PR

=21.54+16.49+28.84

=<u>66.87 </u><u>km</u>

c. If an observer’s boat is located at the midpoint of the second leg of the race, calculate the distance between this boat and the finishing point?

Solution given:

<u>distance between this boat and the finishing point</u>=\frac{leg\:2}{2}=\frac{16.49}{2}=8.25units

=<u>8.25 </u><u>k</u><u>m</u>

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SCORPION-xisa [38]

Answer:

Alex can buy "3" socks

Step-by-step explanation:

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7 0
3 years ago
Question 1
drek231 [11]

QUESTION 1

We want to expand (x-2)^6.


We apply the binomial theorem which is given by the  formula

(a+b)^n=^nC_0a^nb^0+^nC_1a^{n-1}b^1+^nC_2a^{n-2}b^2+...+^nC_na^{n-n}b^n.

By comparison,

a=x,b=-2,n=6.


We substitute all these values to obtain,


(x-2)^6=^6C_0x^6(-2)^0+^6C_1x^{6-1}(-2)^1+^6C_2x^{6-2}(-2)^2+^6C_3x^{6-3}(-2)^3+^6C_4x^{6-4}(-2)^4+^6C_5x^{6-5}(-2)^5+^6C_6x^{6-6}(-2)^6.


We now simplify to obtain,

(x-2)^6=^nC_0x^6(-2)^0+^6C_1x^{5}(-2)^1+^6C_2x^{4}(-2)^2+^6C_3x^{3}(-2)^3+^6C_4x^{2}(-2)^4+^6C_5x^{1}(-2)^5+^6C_6x^{0}(-2)^6.

This gives,

(x-2)^6=x^6-12x^{5}+60x^{4}-160x^{3}(-2)^3+240x^{2}-1925x+64.


Ans:C

QUESTION 2


We want to expand

(x+2y)^4.


We apply the binomial theorem to obtain,


(x+2y)^4=^4C_0x^4(2y)^0+^4C_1x^{4-1}(2y)^1+^4C_2x^{4-2}(2y)^2+^4C_3x^{4-3}(2y)^3+^4C_4x^{4-4}(2y)^4.


We simplify to get,


(x+2y)^4=x^4(2y)^0+4x^{3}(2y)^1+6x^{2}(2y)^2+4x^{1}(2y)^3+x^{0}(2y)^4.


We simplify further to obtain,


(x+2y)^4=x^4+8x^{3}y+24x^{2}y^2+32x^{1}y^3+16y^4


Ans:B


QUESTION 3

We want to find the number of terms in the binomial expansion,

(a+b)^{20}.


In the above expression, n=20.


The number of terms in a binomial expression is (n+1)=20+1=21.


Therefore there are 21 terms in the binomial expansion.


Ans:C


QUESTION 4


We want to expand

(x-y)^4.


We apply the binomial theorem to obtain,


(x-y)^4=^4C_0x^4(-y)^0+^4C_1x^{4-1}(-y)^1+^4C_2x^{4-2}(2y)^2+^4C_3x^{4-3}(-y)^3+^4C_4x^{4-4}(-y)^4.


We simplify to get,


(x+2y)^4=^x^4(-y)^0+4x^{3}(-y)^1+6x^{2}(-y)^2+4x^{1}(-y)^3+x^{0}(-y)^4.


We simplify further to obtain,


(x+2y)^4=x^4-4x^{3}y+6x^{2}y^2-4x^{1}y^3+y^4


Ans: C


QUESTION 5

We want to expand (5a+b)^5


We apply the binomial theorem to obtain,

(5a+b)^5=^5C_0(5a)^5(b)^0+^5C_1(5a)^{5-1}(b)^1+^5C_2(5a)^{5-2}(b)^2+^5C_3(5a)^{5-3}(b)^3+^5C_4(5a)^{5-4}(b)^4+^5C_5(5a)^{5-5}(b)^5.


We simplify to obtain,

(5a+b)^5=^5C_0(5a)^5(b)^0+^5C_1(5a)^{4}(b)^1+^5C_2(5a)^{3}(b)^2+^5C_3(5a)^{2}(b)^3+^5C_4(5a)^{1}(b)^4+^5C_5(5a)^{0}(b)^5.


This finally gives us,


(5a+b)^5=3125a^5+3125a^{4}b+1250a^{3}b^2+^250a^{2}(b)^3+25a(b)^4+b^5.


Ans:B

QUESTION 6

We want to expand (x+2y)^5.

We apply the binomial theorem to obtain,

(x+2y)^5=^5C_0(x)^5(2y)^0+^5C_1(x)^{5-1}(2y)^1+^5C_2(x)^{5-2}(2y)^2+^5C_3(x)^{5-3}(2y)^3+^5C_4(x)^{5-4}(2y)^4+^5C_5(x)^{5-5}(2y)^5.


We simplify to get,


(x+2y)^5=^5C_0(x)^5(2y)^0+^5C_1(x)^{4}(2y)^1+^5C_2(x)^{3}(2y)^2+^5C_3(x)^{2}(2y)^3+^5C_4(x)^{1}(2y)^4+^5C_5(x)^{0}(2y)^5.


This will give us,

(x+2y)^5=x^5+^10(x)^{4}y+40(x)^{3}y^2+80(x)^{2}y^3+80(x)y^4+32y^5.


Ans:A


QUESTION 7

We want to find the 6th term  of (a-y)^7.


The nth term is given by the formula,

T_{r+1}=^nC_ra^{n-r}b^r.

Where r=5,n=7,b=-y


We substitute to obtain,


T_{5+1}=^7C_5a^{7-5}(-y)^5.


T_{6}=-21a^{2}y^5.


Ans:D


QUESTION 8.

We want to find the 6th term of (2x-3y)^{11}


The nth term is given by the formula,

T_{r+1}=^nC_ra^{n-r}b^r.

Where r=5,n=11,a=2x,b=-3y


We substitute to obtain,


T_{5+1}=^{11}C_5(2x)^{11-5}(-3y)^5.


T_{6}=-7,185,024x^{6}y^5.


Ans:D

QUESTION 9

We want to find the 6th term  of (x+y)^8.


The nth term is given by the formula,

T_{r+1}=^nC_ra^{n-r}b^r.

Where r=5,n=8,a=x,b=y


We substitute to obtain,


T_{5+1}=^8C_5(x)^{8-5}(y)^5.


T_{6}=56a^{3}y^5.


Ans: A


We want to find the 7th term  of (x+4)^8.


The nth term is given by the formula,

T_{r+1}=^nC_ra^{n-r}b^r.

Where r=6,n=8,a=x,b=4


We substitute to obtain,


T_{6+1}=^8C_5(x)^{8-6}(4)^6.


T_{7}=114688x^{2}.


Ans:A





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