Respuesta :

vaibhav07

Answer: After 6 hour for the first question

Step-by-step explanation: Cause ∣x+

1−x

2

​

∣=

2

​

(2x

2

−1)\Leftright∣cos\alp+sin\alp∣=

2

​

(2cos

2

\alp−1)

∣

N

2

c

o

s

(

\alp

−

π

4

)

∣

=

N

2

c

o

s

(

2

\alp

)

\Right

\alp

∈

[

0

;

π

4

]

∪

[

3

π

4

;

π

]

∣N

2

​

cos(\alp−

4

π

​

)∣=N

2

​

cos(2\alp)\Right\alp∈[0;

4

π

​

]∪[

4

3π

​

;π]

1)

\alp

∈

[

0

;

π

4

]

\alp∈[0;

4

π

​

]

c

o

s

(

\alp

−

π

4

)

=

c

o

s

(

2

\alp

)

…

cos(\alp−

4

π

​

)=cos(2\alp)…

2.

\alp

∈

[

3

π

4

;

π

]

\alp∈[

4

3π

​

;π]

−

c

o

s

(

\alp

−

π

4

)

=

c

o

s

(

2

\alp

)

…

−cos(\alp−

4

π

​

)=cos(2\alp)…

dragonlover1111

Answer:

First answer is 5 hours

Second answer is 7 weeks

First question explanation:

Make an equation to find out when the companies prices are equal

Let x be the number of hours, so we isolate that one

10 +5x = 7x

subtract 5x from both sides

10= 2x

5=x

Second question explanation:

Same as the first one, setting up an equation as follows:

let x be number of weeks

500-20x=150+30x

add 20x to both

500 = 150 + 50x

subtract 150 from both sides

350 = 50x

divide both sides by 50

7 = x

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