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rosijanka [135]

3 years ago

14

Billy and Alyssa helped pack books to donate to a charity Bill packed 28 boxes withe 30 books in each box.how many more books di

d bill pack show your work

1 answer:

OverLord2011 [107]3 years ago

7 0

Answer

He packed 3 more

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Prove algebraically that r = 10/2+2sinTheta is a parabola

Xelga [282]

Answer:

$y = - \frac{ 1 }{10} {x}^{2} + \frac{5}{2}$

Step-by-step explanation:

We want to prove algebraically that:

$r = \frac{10}{2 + 2 \sin \theta}$

is a parabola.

We use the relations

${r}^{2} = {x}^{2} + {y}^{2}$

and

$y = r \sin \theta$

Before we substitute, let us rewrite the equation to get:

$r(2 + 2 \sin \theta) = 10$

Or

$r(1+ \sin \theta) = 5$

Expand :

$r+ r\sin \theta= 5$

We now substitute to get:

$\sqrt{ {x}^{2} + {y}^{2} } + y = 5$

This means that:

$\sqrt{ {x}^{2} + {y}^{2} }=5 - y$

Square:

${x}^{2} + {y}^{2} =(5 - y)^{2}$

Expand:

${x}^{2} + {y}^{2} =25 - 10y + {y}^{2}$

${x}^{2} =25 - 10y$

${x}^{2} - 25 = - 10y$

$y = - \frac{ {x}^{2} }{10} + \frac{5}{2}$

This is a parabola (0,2.5) and turns upside down.

4 0

3 years ago

Helpppp me correct this pls :(

Anit [1.1K]

So basically you counting by 3

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2 years ago

NEED HELP ASAP ALGEBRA 2<br> Find the third side in simplest radical form

gladu [14]

Answer:

36

Step-by-step explanation:

a² + b² = c²

a² + 77² = 85²

a² + 5929 = 7225

a² = 1296

a = 36

3 0

3 years ago

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Solve the equation.<br> 5x4 - 2x2 - 3 = 0

MissTica

Answer is: 13 = 0
If you’re determining whether it’s true or false. It’s false

4 0

3 years ago

What is the answer for this problem if f(x)= 3x+10x and g(x)=5x-3, find (f+g)(x).

hammer [34]

$(f+g)(x) =f(x)+g(x)=3x+10x+5x-3=\boxed{18x-3}\ D.$

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3 years ago

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