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____ [38]
3 years ago
6

Please help me with this problem.

Mathematics
1 answer:
MrRa [10]3 years ago
3 0

Step-by-step explanation:

cos(x + 45 \degree) + cos(x  -  45 \degree) =  \sqrt{2}  \\ cosx  \: cos45 \degree - sinx  \: sin45 \degree  \\ + cosx  \: cos45 \degree  + sinx  \: sin45 \degree  =  \sqrt{2}  \\ 2cosx  \: cos45 \degree =  \sqrt{2}  \\ 2cosx \times  \frac{1}{ \sqrt{2} }  =  \sqrt{2}  \\ 2cosx =  \sqrt{2}  \times  \sqrt{2}  \\ 2cosx = 2 \\ cosx =  \frac{2}{2}  \\ cosx = 1 \\ cosx = cos \: 0 \degree \\ \huge \red{ \boxed{ x = 0 \degree}} \\

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If two sweaters and four shirts cost $150, and four sweaters and three shirts cost $200, find the price of each shirt and each s
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Answer:

shirt = $20

sweater = $35

Step-by-step explanation:

This question would be solved using simultaneous equation

Let the price of sweater be represented by a

Let the price of shirt be represented by b

The following equations can be derived from the question

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4a + 3b = 200   equation 2

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divide both sides of the equation by 5

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Answer:

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Step-by-step explanation:

To find this answer, we can use the formula A=PxW

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A=1.25x20

This gets us to 25

So Evan is correct!

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2 years ago
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