3 years ago

I need help in 10th grade math if you have any tips please help me

Mathematics

1 answer:

TiliK225 [7]3 years ago

7 0

Answer:

I'll try to help you

..........

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Find an equivalent expression to this: 3xy + 4x + 8 + ( -2 )

Arlecino [84]

3xy + 4x -16 ...... I hope that helps .

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3 years ago

A dog groomer could clean five dogs in an hour. how many could they clean in two sixths of an hour?

DENIUS [597]

2/6 = 1/3
1/3 of hour = 20minutes
5 / 3 = so 1 and 2/3 (?) dogs = 20 minutes

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4 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.