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3 years ago

6

Please help, this is all I need then I can watch tv!!!

1 answer:

elena55 [62]3 years ago

8 0

Answer:

2.5

Step-by-step explanation:

CD = [AC * CB]/AB = [3 *4]/5 = 12/5 = 2.4

(AB = sqrt(AC^2 +CB^2) )

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GIVING BRAINLIEST IN A HURRY

Debora [2.8K]

C. 5 is the correct answer

4 0

3 years ago

Two-thirds of a number added to itself is 20. What is the number?

vivado [14]

Answer:

12

Step-by-step explanation:

2/3 x + x = 20

2/3 x + 3/3x = 20

5/3 x = 20 ... times 3/5 both sides

x = 12

check: 2/3 x 12 + 12 = 8 + 12 = 20

8 0

3 years ago

Which equation is equivalent to

Aleksandr [31]

Answer:

(4x^2 +9)(4x^2-9) =0

Step-by-step explanation:

16x^4 - 18 = 0

Rewriting

(4x^2)^2 - 9^2 =0

We notice that this is the difference of squares

a^2 - b^2 = (a-b)(a+b)

(4x^2 -9)(4x^2+9) =0

5 0

3 years ago

Read 2 more answers

The actual depth of a lake is 15.8 meters.

Anna35 [415]

Answer:

0.2 meters

Step-by-step explanation:

16-15.8 is 0.2 haha

8 0

3 years ago

Please help me ASAP?!!

Blababa [14]

Answer:

(0,-5) and (-4,3)

Step-by-step explanation:

The given equations are

$\left \{ {{x^2+y^2=25} \atop {2x+y=-5}} \right.$

Make y the subject in the second equation;

$y=-2x-5$

Substitute into the first equation;

$x^2+(-2x-5)^2=25$

Expand:

$x^2+4x^2+20x+25=25$

$x^2+4x^2+20x+25-25=0$

$5x^2+20x=0$

$5x(x+4)=0$

$\Rightarrow x=0,x=-4$

When x=0,

$y=-2(0)-5=-5$

This gives; (0,-5)

When x=-4

$y=-2(-4)-5=3$

This gives (-4,3)

7 0

3 years ago

Read 2 more answers