3 years ago

Join my Blooket 710223 that's the code

Mathematics

2 answers:

Marianna [84]3 years ago

8 0

Answer:

Step-by-step explanation:

Andrews [41]3 years ago

3 0

Answer:ok

Step-by-step explanation:

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John is 2 years younger than 3 times his sisters age, how old is his sister? Defineyour varieble and solve your equation.

Ann [662]

You need his sisters age to solve the problem. if y is the sisters age and x is Johns age, then the equation is
3y-2=x

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3 years ago

There is a photo attached<br><br>tan 270 is incorrect!

wlad13 [49]

$\dfrac{1-\cos135^\circ}{\sin135^\circ}=\dfrac{1-\left(\cos^2 67.5^\circ-\sin^2 67.5^\circ\right)}{2\sin67.5^\circ\cos67.5^\circ}=\dfrac{1-\left(1-\sin^2 67.5^\circ-\sin^2 67.5^\circ\right)}{2\sin67.5^\circ\cos67.5^\circ}=\medskip\\=\dfrac{2\sin^2 67.5^\circ}{2\sin67.5^\circ\cos67.5^\circ}=\dfrac{\sin 67.5^\circ}{\cos 67.5^\circ}=\tan 67.5^\circ$