3 years ago

Help please and show work

1 answer:

8 0

So the radius is 7 inch which is given
Use the formula for the circumference which is 2xpiXradius
2x3.1415x7=44 to nearest integer

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Write the rectangular equation (x+5) 2 + y 2 = 25 in polar form.

Serjik [45]

Answer:

r = -10*cos(t)

Step-by-step explanation:

To write the rectangular equation in polar form we need to replace x and y by:

$x=r*cos(t)\\y=r*sin(t)$

Replacing on the original equation, we get:

$(x+5)^2+y^2=25\\x^2+10x+25+y^2=25\\(r*cos(t))^2+10*(r*cos(t))+25+(r*sin(t))^2=25$

Using the identity $sin^2(t)+cos^2(t)=1$ and solving for r, we get that the polar form of the equation is:

$(r*cos(t))^2+10*(r*cos(t))+25+(r*sin(t))^2=25\\r^2cos^2(t)+10rcos(t)+r^2sin^2(t)=0\\r^2cos^2(t)+r^2sin^2(t)=-10rcos(t)\\r^2(cos^2(t)+sin^2(t))=-10rcos(t)\\r^2=-10rcos(t)\\\\r=-10cos(t)$

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4 years ago

Suppose that 10% of people own dogs. If you pick two people at random what is the probability that they both own a dog?

son4ous [18]

Answer: probability 0.01 %

Step-by-step explanation:

P(A) = 10% = 10/100 = 0.10

pick two people -

= P(A).P(A)

= 0.10 times 0.10

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probability = 0.01

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3 years ago

Simplify :<br> 26-10/2x5+3

zvonat [6]

Answer:

16/13 is the answer.

26-10 is 16 and 2x5+3 is 13

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Volume of a rectangular Pyramid that has a height of 9 cm length of 8 cm and a width of 9 cm

Alexus [3.1K]

Answer:

length = 8 cm

breadth = 9 cm

height = 9cm

Volume = ?

now,

Volume = l×b×h

= 8cm ×9cm ×9cm

= 648 cm^3.

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3 years ago

Which statement must be true?

diamong [38]

I think it’s A Im not completely sure tho.

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3 years ago