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Oksi-84 [34.3K]

3 years ago

12

What is the common denominator of in the complex fraction 1 1? atb ab

1 answer:

svetoff [14.1K]3 years ago

5 0

1/1 will be ghee answer my

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Two customers went to a post office to buy postcards and large envelopes. Each postcard

astraxan [27]

The right answer is Option A.

Step-by-step explanation:

Let,

x be the postcards

y be the large envelops

According to given statement;

14x+5y=12 Eqn 1

10x+15y=24.80 Eqn 2

Multiplying Eqn 1 by 3;

$3(14x+5y=12)\\42x+15y=36\ \ \ Eqn \ 3$

Subtracting Eqn 2 from Eqn 3;

$(42x+15y)-(10x+15y)=36-24.80\\42x+15y-10x-15y=11.20\\32x=11.20\\$

Dividing both sides by 32

$\frac{32x}{32}=\frac{11.20}{32}\\x=0.35$

Putting x=0.35 in Eqn 1;

$14(0.35)+5y=12\\4.90+5y=12\\5y=12-4.90\\5y=7.10$

Dividing both sides by 5

$\frac{5y}{5}=\frac{7.10}{5}\\y=1.42$

Therefore, one large envelope costs $1.42

The right answer is Option A.

Keywords: linear equations, subtraction

Learn more about linear equations at:

#LearnwithBrainly

4 0

3 years ago

Calculating Profit Using this table, calculate the profit at each level of bicycle production. One bike: -$ Two bikes: $ Three b

leonid [27]

Answer:

1~30

2~3

3~40

4~70

5~90

6~90

7~80

Step-by-step explanation:

subtract the total revenue from the total cost

8 0

3 years ago

What does x equal in the equation -6x +10x = 20?

Sliva [168]

Answer:

5

Step-by-step explanation:

-6x +10x = 20

4x=20

x=20/4

x=5

3 0

2 years ago

What is the inverse of the function f(x) = 2x – 10?

Natasha2012 [34]

Answer:

f^-1 (x)=1/2x+5

Step-by-step explanation:

y=2x-10

x=2y-10

2y=x+10

y=1/2x+10/2

y=1/2x+5

7 0

3 years ago

10(14-6) what is value of expression

Annette [7]

Answer:

80

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers