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3 years ago

7

Help please :( It’s due In a couple of hours

1 answer:

zhenek [66]3 years ago

8 0

D+b(3) just put them all together

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Yo can somebody help me with this question

nydimaria [60]

Answer:

$\huge\boxed{x=9}$

Step-by-step explanation:

$\angle A\cong\angle B\qquad\text{therefore}\qquad AC\cong BC\Rightarrow|AC|=|BC|\\\\\text{We have}\ |AC|=20;\ BC=3x-7.\\\\\text{Therefore}\\\\3x-7=20\qquad|\text{add 7 to both sides}\3x-7+7=20+7\\\\3x=27\qquad|\text{divide both sides by 3}\\\\\dfrac{3x}{3}=\dfrac{27}{3}\\\\x=9$

6 0

3 years ago

DB is a diameter of circle C. KAis a tangent line to circle C at point A.

Arte-miy333 [17]

Answer:

BAD is 67°

ABC is 90°

Step-by-step explanation:

ABC is 90 due to the diameter rule in circle theorem

If you need any other help alert me

5 0

3 years ago

2. A small submarine is at an elevation of -30 feet compared to sea level. What is its elevation att

Zolol [24]

A 1. Realy jjjjjjjjj

5 0

3 years ago

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

What is 1/2 times 2/1, i need explenation

Debora [2.8K]

Answer:

1

Step-by-step explanation:

(1/2)(2/1)=2/2=1

6 0

3 years ago

Read 2 more answers