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3 years ago

I need the answer please

Mathematics

1 answer:

navik [9.2K]3 years ago

6 0

Y/4-7=3
y/4=7+3
y/4=10 /4
y=40

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The combination for a lock is a 3-digit number. The digits are the prime factors of 42 listed from least to greatest. What is th

Dvinal [7]

Answer:

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Step-by-step explanation:

Since you know your multiplication tables, you know that ...

42 = 6 × 7

and

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The numbers 2, 3, and 7 are prime numbers (not further divisible). This list is in order least to greatest, so is the combination of the lock.

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4 years ago

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2 years ago

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4 years ago

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Wewaii [24]

Answer:

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7 0

3 years ago

Cos3x=4cos^3x-3cosx prove

IgorC [24]

$\bf cos(\alpha + \beta)= cos(\alpha)cos(\beta)- sin(\alpha)sin(\beta)
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\textit{also recall that }cos(2\theta)=
\begin{cases}
cos^2(\theta)-sin^2(\theta)\\
1-2sin^2(\theta)\\
\boxed{2cos^2(\theta)-1}
\end{cases}
\\\\\\
and\qquad sin^2(\theta)+cos^2(\theta)=1\implies sin^2(\theta)=1-cos^2(\theta)\\\\
-------------------------------$

$\bf cos(3x)=4cos^3(x)-3cos(x)\\\\
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2cos^3(x)-cos(x)~~~~-~~~~2cos(x)+2cos^3(x)
\\\\\\
4cos^3(x)-3cos(x)$

6 0

3 years ago