2 years ago

Solve 1/2n x (n+1) =78

Mathematics

2 answers:

Leya [2.2K]2 years ago

7 0

Answer:

n=-13, n=12

Step-by-step explanation:

zavuch27 [327]2 years ago

6 0

Answer: n = 12, -13

We have to isolate the variable by dividing each side by factors that don't contain the variable.

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Solve for x in the given interval. sec x= -2√3/3, for π/2 ≤x≤π

drek231 [11]

Answer:

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Step-by-step explanation:

The given function is

$\sec x=-\frac{2\sqrt{3} }{3},\:\:for\:\:\frac{\pi}{2}\le x \le \pi$

Recall that the reciprocal of the cosine ratio is the secant ratio.

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$\Rightarrow \cos x=-\frac{\sqrt{3}}{2}$

We take the inverse cosine of both sides to obtain;

$x=\cos^{-1}(-\frac{\sqrt{3}}{2})$

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