What is -(-9) A. -9 B. 9

Mathematics

2 answers:

4vir4ik [10]4 years ago

7 0

Answer:

Step-by-step explanation:

skad [1K]4 years ago

5 0

Hey hey.

The answer is 9 so B

Since two negatives make a postive

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I need help on this please

marishachu [46]

Ya I think it is also the second one

5 0

3 years ago

Cos(2theta)=11 sin(theta)-5

lubasha [3.4K]

$\cos2\theta=11\sin\theta-5$
$1-2\sin^2\theta=11\sin\theta-5$
$2\sin^2\theta+11\sin\theta-6=0$
$(2\sin\theta-1)(\sin\theta+6)=0$
$\implies\begin{cases}2\sin\theta-1=0\\\sin\theta+6=0\end{cases}$

The second equation gives $\sin\theta=-6$ , but $-1\le\sin\varphi\le1$ for any real $\varphi$ , so we can ignore this equation.

This leaves us with

$2\sin\theta-1=0\implies \sin\theta=\dfrac12\implies\theta=\dfrac\pi6+2\pi k,\theta=\dfrac{5\pi}6+2\pi k$

where $k$ is any integer.