1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ivenika [448]
3 years ago
12

If 18 , x , y , -3 are in A.P then find x + y.

Mathematics
1 answer:
AleksandrR [38]3 years ago
6 0

Answer:

15

Step-by-step explanation:

If this is an arithmetic progression, then there is a common difference.

-3-18 = -21

-21/3 = -7

18 - 7 = x

x = 11

11 - 7 = y

y = 4

4 - 7 = -3

x + y

11 + 4 = 15

You might be interested in
On a set of blueprints for a new home, the contractor has established a scale of 0.5in : 10 ft. What are the dimensions on the b
Kipish [7]

Answer:

The dimensions on the blueprints are 0.9 inches and 0.8 inches

Step-by-step explanation:

* Lets explain the relation between the drawing dimensions and

 the real dimensions

- A scale drawing make a real object with accurate sizes reduced

 or enlarged by a certain amount called the scale

- Ex: If the scale drawing is 1 : 10, so anything drawn with the size of

 1 have a size of 10 in the real so a measurement of 15 cm on the

 drawing will be 150 cm on the real

- In a scale drawing, all dimensions have been reduced by the same

 proportion

* Lets solve the problem

- On a set of blueprints for a new home, the contractor has

  established a scale of 0.5 in : 10 ft

∵ The drawing scale ratio must be in same unit

∴ Change the feet to inch

∵ 1 foot = 12 inches

∴ 10 feet = 10 × 12 = 120 inches

∴ The scale is 0.5 inches : 120 inches

- Simplify the scale by multiply it by 2

∴ The scale is 1 in : 240 in

- Lets find the dimensions on the blueprints

∵ The real dimensions are 18 feet and 16 feet

- Change the feet to inches

∴ 18 feet = 18 × 12 = 216 inches

∵ 16 feet = 16 × 12 = 192 inches

∵ The scale is 1 : 240

∴ 1/240 = x/216 ⇒ use cross multiplication

∴ 240 x = 216 divide both sides by 240

∴ x = 0.9 inch

∵ The scale is 1 : 240

∴ 1/240 = y/192 ⇒ use cross multiplication

∴ 240 y = 192 divide both sides by 240

∴ y = 0.8 inch

* The dimensions on the blueprints are 0.9 inches and 0.8 inches

8 0
3 years ago
Please show me the steps to solve this<br><br> 2n^2 = -144
Julli [10]

Answer: \large \boldsymbol{}  \pmb{6\sqrt{2}  i}

Step-by-step explanation:

\large \boldsymbol{} \bf  i=\sqrt{-1} \\\\ 2n^2=-144   \\\\n^2=-72 \\\\n=6\sqrt{2}  i

5 0
2 years ago
Read 2 more answers
How many meters did a fish swim in 8 minutes at a speed of s meters per minute?
ch4aika [34]

Answer:

Distance traveled by the fish = 8s meters

Step-by-step explanation:

Speed of a fish to swim = s meter per minute And formula used for the speed, Speed = s = Distance = s × time We have to find the distance covered by the fish in 8 minutes (t = 8 minutes) Therefore, Distance traveled by the fish = 8s meters

I Hope This Helps You! <3

5 0
3 years ago
X^2+6x+3/x+2 <br> divide polynomial
melamori03 [73]

Answer:

x

=

±

2

√

3

−

3

Step-by-step explanation:

Add

3

to both sides of the equation.

x

2

+

6

x

=

3

To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of

b

.

(

b

2

)

2

=

(

3

)

2

Add the term to each side of the equation.

x

2

+

6

x

+

(

3

)

2

=

3

+

(

3

)

2

Simplify the equation.

Tap for more steps...

x

2

+

6

x

+

9

=

12

Factor the perfect trinomial square into

(

x

+

3

)

2

.

(

x

+

3

)

2

=

12

8 0
3 years ago
I WILL MARK U AS A BRAINLIEST! Please help question on the picture.
tester [92]

Answer:

just wanted to let you know you didn't attach a picture would love to answer question in comments once I can see the photo

6 0
3 years ago
Other questions:
  • A square pyramid with a = 20 mm and b = 96 mm is shown. What is the length of side c? *Hint: you must divide the "b" by two to f
    13·2 answers
  • What is the value of x?<br><br> A. 6<br> B. 4<br> C. 10<br> D. 16
    7·1 answer
  • Write the fraction as a decimal -12/25
    14·1 answer
  • What is the solution to the equation? 2/3a -1/6=1/3
    6·1 answer
  • Help guys show your solution and answer the question​
    15·1 answer
  • The temperature falls from 0 degrees to Negative 12 and one-fourth degrees in 3 and one-half hours. Which expression finds the c
    11·2 answers
  • Hi my friend plays this game called Animal jam classic, all she's wanted was a membership, but her fam can't afford it, both of
    8·1 answer
  • If 1+1=2 then what's 2+2
    8·2 answers
  • How is this excerpt important to the poem as a whole?
    13·1 answer
  • PLEASE HELP ME I REALLY NEED IT
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!