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2 years ago

12

Claim: Fewer than 93% of adults have a cell phone. In a reputable poll of 1059 adults, 88% said that they have a cell phone.

Find the value of the test statistic.

1 answer:

kirill [66]2 years ago

4 0

The answer would be = -16.60
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The range of y= 2/3 sin x for pi < x < 3pi/2 is ___?

victus00 [196]

Answer:

-2/3 < y < 0

Step-by-step explanation:

y = Asin(x)

Edit*

There's a node (y=0) at pi for sine wave. At 3/2pi will be the min. So range goes from -2/3 to 0

5 0

3 years ago

PLEASE HELP AND SHOW YOUR WORK!!

trasher [3.6K]

Answer: The answer would be B) 9% Decrease!

275 - 250 = 25.

25/275 = 0.0909090909

0.0909090909 x 100 = 9.09090909091

Finally you'd round it to 9%.

Therefore there was a 9% decrease in the amount of large pizzas.

Hope this helps (: Stay safe.

8 0

3 years ago

Read 2 more answers

Show that cos(3x) = cos3(x) − 3 sin2(x)cos(x). (Hint: Use cos(2x) = cos2(x) − sin2(x) and the cosine sum

otez555 [7]

<u>Step-by-step explanation:</u>

To prove:

$\cos 3x=\cos^3x-3\sin^2 x\cos x$

Identities used:

$\cos(A+B)=\cos A\cos B+\sin A\sin B$ ......(1)

$\sin 2A=2\sin A\cos A$ ........(2)

$\cos 2A=\cos^2A-\sin^2 A$ .......(3)

Taking the LHS:

$\Rightarrow \cos 3x=\cos (x+2x)$

Using identity 1:

$\Rightarrow \cos (x+2x)=\cos x\cos 2x-\sin x\sin 2x$

Using identities 2 and 3:

$\Rightarrow \cos x(\cos ^2x-\sin^2 x)-\sin x(2\sin x\cos x)\\\\\Rightarrow \cos^3x-\sin^2x\cos x-2\sin^2 x\cos x\\\\\Rightarrow \cos^3x-3\sin^2x\cos x$

As, LHS = RHS

Hence proved

4 0

3 years ago

Frank invested $1000 in an account with a 6% interest rate compounded annually. How much is the account after 3 years?

Wewaii [24]

I belive c is the corect awnser

4 0

3 years ago

2 trains leave the same station at the same time but opposite directions.One train travels at 70mph and the other travels at 80m

Oliga [24]

It would be 13 hours went they pass

8 0

3 years ago