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3 years ago

12

Five divided by two multiplied by a number then decreased by eleven is equal to four. Find the number.

2 answers:

Ratling [72]3 years ago

7 0

Yea the first one is right

I am Lyosha [343]3 years ago

3 0

Answer:

the number = 8/5 or 1 3/5 or 1.6

Step-by-step explanation:

n = the number

5/2n - 11 = 4

5/2n - 11 + 11 = 5 / 2n

5/2n = 4

5/2n / 5/2 = n

4 / 5/2 = 8/5

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Step-by-step explanation:

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5 0

3 years ago

Prove this trigonometric identity<br>sin 3x/sin x - cos 3x/cos x =2

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Step-by-step explanation:

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<u>=</u><u>sin3xcosx- cos3xsinx</u>

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sinxcosx

= <u>2sin2x</u>

2sinxcosx

=<u> </u><u>2sin2x</u><u> </u>

sin2x

=2

= RHS.

Proved.

8 0

3 years ago