The diagram shows a periscope used to see objects that are behind or under a barrier. What makes it possible to see an object when looking through a periscope? The periscope –
A. contains mirrors that reflect the object
B. magnifies small objects so they can be seen
C. absorbs the light rays passing through it
D. separates the light into different colors

Answers

Answer 1

Answer: A. contains mirrors that reflect the object

Step-by-step explanation:

A periscope contains mirrors in it that are on opposite sides and are arranged in a 45° angle to each other. It works by light striking the first mirror which cause its to reflect it at a 45° angle to the next mirror.

Depending on the length of the periscope, this continues until the last mirror reflects the incoming light to the eyes of the person using the periscope thereby allowing them to see objects hidden behind or under a barrier.

Related Questions

what is the equation of a line that is parralel to 2x+3y=3 and passes through the point (3,-4)

Answers

3y=-2x+3
y=-2/3x+b

When you want to find the point that a line travels through, you always want to ignore the b value. Two lines are parallel if they have EXACTLY the same slope. Y-intercept does not matter.

Plug in the x and y in the equation

-4=-2/3(3)+b
-4=-2+b
-2=b

Equation: y=-2/3x-2

2. The table shows distance, y, that Mario runs in x minutes.

Mario’s Running Speed

Time,

(min) Distance,

(mi)

7 | 1

21 | 3

35 | 5

(a) Based on the information in the table, write an equation that can be used to model the relationship between the time (x) and distance (y). Show your work.

(b) What is the rate of change for this linear relationship? Show your work.

(c) What is Mario’s distance given that he ran for 70 minutes? Show your work.

Answer:

Answers

Assuming the left is minutes and the right is distance, Mario runs 1 mile in 7 minutes
(a) y=x/7
(b) the rate of change is 7
(c) if he ran for 70 minutes then his distance is 10 miles.
*for (c) just plug in the number given. Replace it with x and divide it by 7.*

what does angle DFE= in degrees?
Type only number for answer

Answers

answer: 40°

explanation: angle AFB and DFE are vertical angles meaning they share the same measurements

I need help with this assignment

Answers

Answer:

1) 3x = 2x + 50

3x - 2x = 50

X= 50

2)6x = 2x + 44

6x - 2x = 44

4x = 44

divide both sides by 4

X = 11

3)8x = 2x + 36

8x - 2x = 36

4x = 36

divide both sides by 4

X = 9

4) 4x = X + 18

4x - X = 18

3x = 18

divide both sides by 3

X= 6

5) 7x + 10 = 3x + 120

collect like terms

7x - 3x = 120 - 10

4x = 110

divide both sides by 4

X = 27.5

6) 20 + 2x = X + 56

collect like terms

2x - X = 56 - 20

X = 36

7) already done

8)12x + 12 = 3x + 84

collect like terms

12x - 3x = 84 - 12

9x = 72

divide both sides by 9

X = 8

9) 3 + 6x = 2x + 27

collect like terms

6x - 2x = 27 - 3

4x = 24

divide both sides by the coefficient of X (4)

X = 6

10) 8x + 2 = 72 + X

collect like terms

8x - X = 72 - 2

7x = 70

divide both sides by the coefficient of X (7)

X = 10

11) 2x + 20 = X + 60

collect like terms

2x - X = 60 - 20

X = 40

12). 4x + 1 = 25 + 2x

collect like terms

4x - 2x = 25 - 1

2x = 24

divide both sides by the coefficient of X (2)

X = 12

I hope this helps

PLEASE HELP ITS EASY MATH AND FIRST ONE WHOS CORRECT WILL GET BRAINLIST

Write an equation in slope-intercept form of the line that passes through the given points.

X Y
-2 , 2

0 , 2

2 , 2

4 , 2

Answers

Here are the steps to the answer. Answer: y=x+2

Answer: I think it's y=2??????

Step-by-step explanation: The shop would be 0, so there would be no x. The slope is zero because the y value never changes.

Please anybody help please

Answers

Answer:

x= -3 and y = 6

Step-by-step explanation:

so basically what you are trying to do is reduce into finding x and y

what you do is you want to find a number to multiply one of the equations in order to get the same x or y value does not matter which

so,...

we can do

either 20x or 15y

we will go with the smallest 15y

so for both equations multiply the whole thing by 5 for the first equation and by 3 for the second

5 x 5x+3y=3 --> 1

3 x 4x+5y=18 --> 2

we then get

25x+15y = 15 -->1

12x + 15y = 54 -->2

then now that you have the same Y values you can subtract ! which cancels out both the 15y

25x+15y = 15 -->1

- 12x + 15y = 54 -->2

13x =-39

so now x=-3 and all you have to do with x = -3 is sub this into either one of the equations that you started with !

x = -3

5(-3) +3y =3

-15 + 3y = 3

3y = 3+15

3y=18

y = 6!

the 15% tip on craig's lunch bill came to $2.40 what was the amount of bill before the tip? show workouts

Answers

Since the tip is 15% of some cost x, we can calculate that.
Remember to write the percent as a decimal for the calculations
Think of the tip as the question 2.40 is 15% of what number?

2.40/x = 15/100
Multiply both sides by x
2.40 = 15x/100
2.40 = 0.15x

So the tip 2.40 = 0.15x
Divide both sides 0.15 to solve for x
And that makes the cost before the tip 2.40/0.15 = 16.00
$16.00
The total bill for his lunch would be the cost before the tip plus the tip

We can calculate the final bill as $16.00 + $2.40 = $18.40

Жилищен блок има еднакъв брой етажи във
всеки вход и еднакъв брой апартаменти на
всеки етаж. Броят на входовете е по-голям
от 1. Броят на апартаментите на етаж е по
голям от броя на входовете и по-малък о
броя на етажите. Колко са етажите, ак
броят на всички апартаменти е 105?

Answers

мой пипи действительно большой, и это круто

I need help please

Answers

(-5,1) is the correct answer or option c:)

What is 19,067 divided by 43

Answers

It could be 443, try simplifying to the nearest hundreaths, hope this helps!

Answer:

so you are going to divide with a calculator

19,067 divided by 43

equals 443.4186047 (simplify)

Step-by-step explanation:

can i have brainliest please

the question is : (–7)(–5)

Answers

Answer: 35.

Step-by-step explanation: The parenthesis with no operation in between is multiplication. double negative makes a positive so its 7 times 5 which is 35.

IL GIVE BRAINLIST!! PLEASE HELP! THERES 2 ANSWERS JUST SAYING!!

Answers

Answer: Option 2

Pls mark me brainilest!

Step-by-step explanation:

Find the measure of the indicated angle to the nearest degree.

?= __∘

Answers

Answer:

x = 30°

Step-by-step explanation:

Use the sine rule:

3x²=12 extracting square roots

Answers

Answer:

x = ± 2

Step-by-step explanation:

Given

3x² = 12 ( divide both sides by 3 )

x² = 4 ( take the square root of both sides )

x = ± [tex]\sqrt{4}[/tex] = ± 2

3*10^4+2.5*10^0
ghfuigffhh

Answers

Answer:

30002.5

Step-by-step explanation:

F (x) = x^2 + 4x; Find f (−7)

Answers

Answer:

f(-7) = 21

General Formulas and Concepts:

Pre-Alg

Order of Operations: BPEMDAS

Step-by-step explanation:

Step 1: Define

f(x) = x² + 4x

f(-7) is x = -7

Step 2: Solve

Substitute: f(-7) = (-7)² + 4(-7)Evaluate: f(-7) = 49 + 4(-7)Multiply: f(-7) = 49 - 28Subtract: f(-7) = 21

Which inequality is shown in the graph?

Answers

Answer: 3ft²?

Step-by-step explanation:

Henry left for the lake in the morning and it was 78°F.
When he arrived at the lake the temperature had increased
7° and by lunch it increased another 5°. What is the
temperature when Henry was eating lunch?

Answers

Answer:

The temputure is -64

Step-by-step explanation:

Same factory has supplies expenses of $1135.78 a day, in addition to the wages above and makes $60,128.72 in one week, what is the factory's total profit or loss in one week?

Answers

Given :

Factory has supplies expenses of $1135.78 a day.

Company earns $60,128.72 in one week.

To Find :

The factory's total profit or loss in one week.

Solution :

Expenses of factory of a week :

E =$( 1135.78 × 7 ) = $7950.46 .

Now, profit is given by :

P = $60,128.72 - $7950.46

P = $52178.26

Therefore, total profit of factory in one week is $52178.26 .

Hence, this is the required solution.

What is 2x+8x=6? Please answer accurately???

Answers

Answer:

x = 3/5

Step-by-step explanation:

2x + 8x = 6

10x = 6

x = 3/5

2x+8x=6
10x=6
6/10=0.6 or 3/5

3/5 or .6

The tuition and fees at a two-year college are $135 per credit hour. If Tyler takes h credit-hours, write an expression for the cost of his tuition and fees.

Answers

Answer:

t=135h, where

t is the cost of tuition and fees

his the number of credit hours

Step-by-step explanation:

Given that the tuition and fees at a two-year college are $135 per credit hour, the expression to calculate the cost of Tyler's tuition and fees would indicate that is equal to the result of multiplying the price per credit hour for the number of hours:

t=135h, where

t is the cost of tuition and fees

his the number of credit hours

Dr. Ochoa's team attached a beam to the International Space Station creating a right angle. If the height of the International Space Station is 110 kilometers and the length of the attached beam is 75 kilometers, how far is the end of the beam from top of the International Space Station? Round your answer to nearest tenth of a kilometer.

Answers

133.1 kilometers

Step-by-step explanation:

Brad had 10 crickets in his pet lizard’s cage. After one day, Brad’s lizard has eaten 20% of the crickets he had put in the cage. By the end of the next day, the lizard had eaten 25% of the remaining crickets. how many crickets were left in the cage at the end of the second day?

Answers

7.5 crickets left (I think)

20%=2

25%(of 2)=0.5

2+.5=2.5

10-2.5=7.5

Hope this helps:)

The candidate that won received 80% of the 260 total votes. How many votes did the non-winning candidate receive?

PLEASE HELP I WILL GET YOU WHATEVER YOU WANT!!

Answers

Answer:

Step-by-step explanation:

20% of 260

Or 52 votes

What is the first step in evaluating the expression shown below?
(12.9-3.1) 6.2-2 + 43

Answers

Answer:

Subtract 3.1 from 12.9

Hope it helped

44.8 is what percent of 160?

Answers

Answer:

28% .................

Answer:

28%

Step-by-step explanation:

100%/x%=160/44.8

(100/x)*x=(160/44.8)*x - we multiply both sides of the equation by x

100=3.5714285714286*x - we divide both sides of the equation by (3.5714285714286) to get x

100/3.5714285714286=x

28=x

x=28

now we have:

44.8 is 28% of 160

YALL BETTER ANSWER THIS PLSSSSSSSSSSS

Answers

Answer:

= 3/16(0.1875)

Step-by-step explanation:

explanation in the image.

Answer:

Step-by-step explanation:

Take out lignes

-1/4x-3/7

= -7/12

simplify (-sqrt of 125)^3

Answers

Answer:

Step-by-step explanation:

[tex]\sqrt[3]{125} =5*5*5=5[/tex]

what expression is equal to(5+x-2)×2

Answers

If you simply the equation it would be 6+2x

Consider the line y = x+4.
Find the equation of the line that is perpendicular to this line and passes through the point (-8, 6).
Find the equation of the line that is parallel to this line and passes through the point (-8, 6).

Answers

When finding the perpendicular slope, you wanna find the reciprocal of the slope and make it negative if it’s originally positive and positive if it’s originally negative. For instance, a slope of 2 would become -1/2. Hope this helps!

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