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
ohaa [14]
3 years ago
15

Can i get some help with these LCD equations please.

Mathematics
1 answer:
Andre45 [30]3 years ago
3 0

Answer:

  y = -1/4

Step-by-step explanation:

  y/5 +3/10 = (y+2)/7

The LCD is 10·7 = 70. Multiplying the equation by 70 gives ...

  14y +21 = 10(y +2)

  14y +21 = 10y +20 . . . . eliminate parentheses

  4y + 21 = 20 . . . . subtract 10y

  4y = -1 . . . . . . . . . subtract 21

  y = -1/4 . . . . . . . . .divide by 4

_____

<em>Check</em>

  (-1/4)/5 +3/10 = (-1/4 +2)/7 . . . . . substitute for y

  -1/20 +6/20 = (7/4)/7 . . . simplify a bit, rewrite 3/10

  5/20 = 1/4 . . . . . . . . . . true

You might be interested in
What is a simplified eCarlotta thinks that 3y + 5y3 is the same as 8y4. Which statement shows that it is NOT the same?Xpression
stira [4]

Questions:

(a) What is a simplified expression for (x + y) – (x – y)?

(b) Carlotta thinks that 3y + 5y^3 is the same as 8y^4. Which statement shows that it is NOT the same?

Answer:

(x + y) - (x - y) =2y

3y + 5y^3 \ne 8y^4

Step-by-step explanation:

Solving (a):

Given

(x + y) - (x - y)

Required

Simplify

(x + y) - (x - y)

Open brackets

(x + y) - (x - y) = x + y - x + y

Collect Like Terms

(x + y) - (x - y) = x - x+ y  + y

(x + y) - (x - y) = y  + y

(x + y) - (x - y) =2y

Solving (b):

Given

3y + 5y^3 and 8y^4

Required

Which expression shows they are not the same

The expression that shows this is:

3y + 5y^3 \ne 8y^4

Take for instance; y=2

Substitute 2 for y in 3y + 5y^3 \ne 8y^4

3*2 + 5*2^3 \ne 8*2^4

Evaluate all exponents

9 + 5*8 \ne 8*16

9 + 40 \ne 128

49 \ne 128

The above expression supports 3y + 5y^3 \ne 8y^4

5 0
2 years ago
AS one of her chores Staci must vacum 1/2 of the house. If she has already vacumed 1/3 of her share tonight whatp part of the li
Tatiana [17]

Answer:

1/6

Step-by-step explanation:

sim[le thought


3 0
3 years ago
3(y + 10) using the distributive property
Solnce55 [7]

Answer:

3y+30

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
The speed of sounds in water is 1.46 x 10^3 meters per second. The speed of sound in air is 3.31 x 10^2 meters per second. How m
dlinn [17]

Answer:

Hey there!

1.46x10^3-3.31x10^2

14.6x10^2-3.31x10^2

11.29x10^2

1.129x10^3

J is the correct answer.

Hope this helps :)

6 0
3 years ago
There are 40 students in your class of which 23 are boys. What fraction of the students are girls?​
Ronch [10]

Answer:17/23

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Other questions:
  • Andrew believes the honor roll students at his school have an unfair advantage in being assigned to the math class they request.
    9·1 answer
  • Maria has added 2 liters of pure water to 8 liters of a 48% sugar syrup. What is the concentration of the resulting solution?
    12·2 answers
  • 5y+1=1<br> Subtract 1 from both sides
    12·1 answer
  • In a survey of 400 randomly selected​ people, it was determined that 22 play soccer. What is the probability that a randomly sel
    14·1 answer
  • There are 91 eighth-grade students signing up for electives.
    8·1 answer
  • A cylindrical can without a top is made to contain 25 3 cm of liquid. What are the dimensions of the can that will minimize the
    15·1 answer
  • How would you convince your parents to let you go vegan or vegetarian?
    8·2 answers
  • WILL GIVE BRAINLIEST; I NEED ANSWERS ASAP
    7·1 answer
  • Arrange the integers 1,4,8,12,17,32 so that all consecutive integers add to a perfect square. Enter your answer with numbers sep
    9·1 answer
  • 3 1/3 divided by 2/3 helppp will give brainlist if good answers
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!