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Verdich [7]
3 years ago
10

What is the value of

Mathematics
2 answers:
svet-max [94.6K]3 years ago
7 0

Answer:

r=4

Step-by-step explanation:

Charra [1.4K]3 years ago
5 0

Answer: r= -4

Step-by-step explanation: 5(r-(-2)) = -10 (get rid of parentheses)

5(r+2) = -10 (divide both sides by 5

r+2 = -2 (subtract 2 from both sides)

r = -4

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Please answer quickly this is due today and I just can’t figure it all out!!
Bumek [7]

Answer:

A. You may set the variables in either order. But for argument sake, let's set as follows:

x = Amount of bookshelves

y = Amount of tables

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x + y > 25

Plus you can determine a second inequality based on the amount of money that you have to spend.

20x + 45y < 675

Finally you may also add in that each value must be greater than or equal to zero, since they cannot have negative tables.

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(0,0)

(18, 7)

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(33.75, 0) or (33, 0) if you insist on rounding.

Step-by-step explanation: Good luck and hope this helps :)

4 0
3 years ago
Prove the identity.<br>cosx sin (x+y) - sinx cos(x+y) = siny​
Jet001 [13]

Answer:

In the explanation

Step-by-step explanation:

Going to start with the sum identities

sin(x+y)=sin(x)cos(y)+sin(y)cos(x)

cos(x+y)=cos(x)cos(y)-sin(x)sin(y)

sin(x)cos(x+y)=sin(x)cos(x)cos(y)-sin(x)sin(x)sin(y)

cos(x)sin(x+y)=cos(x)sin(x)cos(y)+cos(x)sin(y)cos(x)

Now we are going to take the line there and subtract the line before it from it.

I do also notice that column 1 have cos(y)cos(x)sin(x) in common while column 2 has sin(y) in common.

cos(x)sin(x+y)-sin(x)cos(x+y)

=0+sin(y)[cos^2(x)+sin^2(x)]

=sin(y)(1)

=sin(y)

6 0
3 years ago
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