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kherson [118]
3 years ago
15

Can someone help me? Plzzzzz :c I need it for tmw

Mathematics
2 answers:
lys-0071 [83]3 years ago
5 0
x-cost\ of\ DVD\\y-cost\ of\ video\ game\\\\ \left \{ {{3x+14y=203\ \ \ } \atop {11x+11y=220\ \ } \right. \\\\ From\ first\ second:\\11x=220-11y\ \ \ \ |:11\\x=20-y\\\\Substitute\ to\ first:\\3(20-y)+14y=203\\60-3y+14y=203\\-3y+14y=203-60\\11y=143\ \ \ \ |:11\\y=13\\\\x=20-13=7\\\\ \left \{ {{y=13} \atop {x=7}} \right.
Sati [7]3 years ago
3 0
3D+14G=203(11)    use elimination      33D+154G=2233
11D+11G=220(-14)   to cancel G   -154D-154G=-3080
                                      
                                     -121D=-847   divide by -121 on both sides
                                         D=7     plug back into equation
11(7)+11G=220
77+11G=220   subtract 77 from both sides
11G=143 divide by 11 on both sides
G=13
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3(h -2 ) = d

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3 years ago
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vichka [17]

4 cos² x - 3 = 0

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Fixing the squared cosine doesn't discriminate among quadrants.  There's one in every quadrant

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Let's do plus first.  In general, cos x = cos a has solutions x = ±a + 2πk integer k

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x = ±π/6 + 2πk

Minus next.

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cos x = cos(5π/6)

x = ±5π/6 + 2πk

We'll write all our solutions as

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3 0
3 years ago
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morpeh [17]
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How many subsets does the set {c,o,v,i,d} have?
3241004551 [841]
<h3>Answer:  32</h3>

Explanation:

If a set has n items inside it, then there will be 2^n different subsets. This includes the original set itself (since any set is a subset of itself).

Here we have n = 5 items in the given set, so there are 2^5 = 32 different subsets.

For more information, I recommend looking up the term "power set".

5 0
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