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3 years ago

What is 3/5 of 7 need help asap as i am not very good at maths thanks :-)

Mathematics

2 answers:

MAVERICK [17]3 years ago

8 0

3/5 of 7

= (3/5) * 7

= 3 * 7/5

= 21/5

= 4.2

I hope this helps. =)

weeeeeb [17]3 years ago

5 0

It's pretty easy, just do 3÷5, which equals 0.6, then multiply 7 by 0.6, which gives you 4.2

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larisa86 [58]

Since $\cot(x)=\frac{2}{3}$ and $\cot^{2} x+1=\csc^{2} x$ , we know that:

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If $\csc x=\frac{\sqrt{13}}{3}$ , this means that $\sin x=\frac{3}{\sqrt{13}}$ and by the Pythagorean identity,

$\sin^{2} x+\cos^{2} x=1\\\left(\frac{3}{\sqrt{13}} \right)^{2}+\cos^{2} x=1\\\frac{9}{13}+\cos^{2} x=1\\\cos^{2} x=\frac{4}13}\\\cos x=\frac{2}{\sqrt{13}}$

Using the double angle formula for sine, $\sin(2x)=2\left(\frac{3}{\sqrt{13}} \right)\left(\frac{2}{\sqrt{13}} \right)=\boxed{\frac{12}{13}}$
Using the double angle formula for cosine, $\cos(2x)=1-2\left(\frac{3}{\sqrt{13}} \right)^{2}=\boxed{-\frac{5}{13}}$
So, since tan=sin/cos, $\tan (2x)=\frac{\sin(2x)}{\cos(2x)}=\frac{\frac{12}{13}}{-\frac{5}{13}}=\boxed{-\frac{12}{5}}$

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2 years ago

Help me pleaseeeeeeeeeeeeee

gregori [183]

Answer:x=1 y=2

Step-by-step explanation:

you add and get 8x=8 x=1 so plugging in one you get 5+2y=9 so 4=2y so y=2

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Alenkasestr [34]

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