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3 years ago

9

Brainliest to best answer!

2 answers:

lora16 [44]3 years ago

8 0

Personally for proving questions especially trigo, i reckon u memorise all of the formulas, esp double angle and half angle.

also, for other types of proving qn like prove d = 1/2 in an a.p, u can always go back to your basics, which is U1 + d = U2.

but, i would say that as long as u practice a lot of questions u should be able to recognise how to prove the questions

zheka24 [161]3 years ago

7 0

Answer:

take your time and always ask for help when needed

Step-by-step explanation:

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3 years ago

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Anton [14]

Answer: $(336.49,\ 355.51)$

Step-by-step explanation:

The confidence interval for population mean is given by :-

$\overline{x}\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size : $n= 314$ , which is a large sample , so we apply z-test .

Sample mean : $\overline{x}=346$

Standard deviation : $\sigma= 86$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

Now, a confidence interval at the 95% level of confidence will be :-

$346\pm(1.96)\dfrac{86}{\sqrt{314}}\\\\\approx346\pm9.51\\\\=(346-9.51,\ 346+9.51)\\\\=(336.49,\ 355.51)$

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3 years ago

How would you locate the point (-3, +7) on a coordinate grid? start at origin

Ivanshal [37]

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3 years ago

Help !!!!!!!!!!!!!!!!!!!!!!!!!

OLga [1]

Answer:

with what

Step-by-step explanation:

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3 years ago