3 years ago

15/4 divide by 5/8. show your reasoning

2 answers:

8 0

15/4 / 5/8
= 15/4 times 8/5 (you flip the 2nd fraction)
15/4 times 8/5 = 120/20
120/20 can be simplified to 6/1=6
The answer is 6

Pani-rosa [81]3 years ago

5 0

Answer:

Step-by-step explanation:

(15/4) ÷ (5/8)

(15/4) × (8/5)

(15/5) × (8/4)

3 × 2 = 6

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Tpy6a [65]

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3 years ago

If sin(x) = 5/13, and x is in quadrant 1, then tan(x/2) equals what?

Rufina [12.5K]

$x$ is in quadrant I, so $0$ , which means $0$ , so $\dfrac x2$ belongs to the same quadrant.

Now,

$\tan^2\dfrac x2=\dfrac{\sin^2\frac x2}{\cos^2\frac x2}=\dfrac{\frac{1-\cos x}2}{\frac{1+\cos x}2}=\dfrac{1-\cos x}{1+\cos x}$

Since $\sin x=\dfrac5{13}$ , it follows that

$\cos^2x=1-\sin^2x\implies \cos x=\pm\sqrt{1-\left(\dfrac5{13}\right)^2}=\pm\dfrac{12}{13}$

Since $x$ belongs to the first quadrant, you take the positive root ( $\cos x>0$ for $x$ in quadrant I). Then

$\tan\dfrac x2=\pm\sqrt{\dfrac{1-\frac{12}{13}}{1+\frac{12}{13}}}$

$\tan x$ is also positive for $x$ in quadrant I, so you take the positive root again. You're left with

$\tan\dfrac x2=\dfrac15$