Can em waves travel through a perfect vacuum?

Answers

Answer 1
Answer: Yes they can.  Otherwise we would get no heat or light
from the sun, nor would we see any other stars.

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Use the method of completing the square to transform the quadratic equation into the equation form (x – p)^2 = q.12 - 8x^2 + x^4 = 0 A) (x2 - 4)2 = -4 B) (x2 - 4)2 = 4 C) (x2 - 2)2 = -4 D) (x2 - 2)2 = 4
Which equation describes the line that contains (1,5) and has a slope of 2
Determine the relationship between the two triangles and whether or not they can be proven to be congruent. ​
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Will mark as brainliest plz help ​

Answers

BC = BD

Step-by-step explanation:

AC = AD

because AB bisect ∠A or

∠CAB = ∠BAD

∴ So, BC = BD

Y=t+a/t-b
express t in terms of a, b and y.
t-b​

Answers

Answer:

t=(a+by)/(y-1)

Step-by-step explanation:

(t-b)y =t+a

ty-by = t+a

ty-by=t+a

ty-by=a+by

t(y-1)=a+by

thus,

t=(a+by)/(y-1)

A rollercoaster ride reaches a height of 80 feet before it sharply drops. The height above the ground of the rollercoaster car during the drop is modeled by the function, h(t)=10t2−40t+80 , where t is measured in seconds since the car started its decline. The model is accurate for 0≤t≤4 . On this portion of the ride, how long does the car take to reach a minimum height from the ground before rising again?

Answers

Answer:

Therefore the car takes 2 s to reach a minimum height from the ground before rising again.

Step-by-step explanation:

Given that a roller coaster ride reach a height of 80 feet.

The height above the ground of the roller coaster is modeled by the function

h(t)=10t²-40t+80

where t is measured in second.

h(t)=10t²-40t+80

Differentiating with respect to t

h'(t)= 10(2t)-40

⇒h'(t)=20t-40

To find the minimum height we set h'(t)=0

∴20t-40=0

⇒20t =40

⇒t=2

The height of the roller coaster minimum when t=2 s.

The minimum height of of the roller coaster is

h(2)= 10(2)²-40.2+80

     =40-80+80

     =40 feet.

Therefore the car takes 2 s to reach a minimum height from the ground before rising again.

Answer:

2s

Step-by-step explanation:

What is the area of the polygon given below? Please explain how you got the answer

Answers

The area is the sum of 3 rectangles areas
First          12 * 19 = 228
Second       3 * 3   = 9
Third           2 * 17 = 34

so the area = 228 + 34 + 9 =   271 square units

The total area is 271 square units.

Here is something that I almost never do, but I'm going to
do it this time:

I almost never draw a picture or a diagram to show how I got
my answer. But this one would be so complicated to try and
explain with text, that I marked my process on top of your
picture, and I attached my final picture to this answer.

It'll show you how I split the whole figure up into one square
and two rectangles, then found the area of each piece, and
then added them all together.


5.45833333333 convert to fraction

Answers

54583333333100000000005.4583333333=5458333333310000000000

you have to move the decimal 
The fraction would be 131/24

Write a polynomial that describes the area of the shaded region.The area of the shaded region is cubic units.
(Simplify your answer. Type an expression using x as the variable.)
N
N
X+7

Answers

so if we take the area of the whole square that's shaded, and then subtract from it the area of the square that's not shaded, what's leftover is the area we never subtracted, namely the shaded region.

\stackrel{ \textit{shaded square} }{(x+7)(x+7)}~~ - ~~\stackrel{ squarish~hole }{(2)(2)}\implies \stackrel{\textit{F O I L}}{(x^2+14x+49)-4} \n\n\n ~\hfill~ x^2+14x+45~\hfill~