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4 years ago

I will never get the hang of these questions help

Mathematics

1 answer:

jeyben [28]4 years ago

4 0

First term is -7, so a_1 = -7

To get the next term, we add on 4. We can see this if we subtract like so
d = (2nd term) - (1st term) = (-3) - (-7) = -3+7 = 4

So d = 4 is the common difference.

Apply a_1 = -7 and d = 4 to get...
a_n = a_1 + d*(n-1)
a_n = -7 + 4*(n-1)
a_n = -7 + (n-1)*4

Answer: Choice A

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Simplify the expression 4.2(5.1x+6.8)

Dominik [7]

Step-by-step explanation:

Step-by-step explanation:

Expand: 4.2×5.1×x+4.2×6.8

4.2×5.1×x to (21.42)x

Simplify: 21.42x+4.2×6.8

4.2×6.8 = 28.5628.56

21.42x+28.56

8 0

3 years ago

It is believed that 43% of the US population can play the piano, 28% can play the guitar, 15% can play the harmonica, 12% can pl

melomori [17]

Answer:

The smallest sample size to satisfy the conditions is n=500.

Step-by-step explanation:

The condition for performing the inference related to the sample size is that, for all the categories, the expected success and failures in the sample are at least 10:

$np\geq10\\\\n(1-p)\geq10$

The largest sample size required will be for the minimum p or (1-p).

This happens to be the proportion that can play other instruments: 2%.

Then, we can calculate the minimum sample size as:

$np\geq10\\\\n(0.02)\geq10\\\\n\geq(10/0.02)\\\\n\geq500$

6 0

3 years ago

sooo i have a question, the currency in malaysia is the ringgit the exchange rate is apparently $1 for every 4 ringgits . At thi

anastassius [24]

Answer:

20 ringgits.

Step-by-step explanation:

Ratio of $1:4 ringgits

5 * 4=20

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3 years ago

X-1/2 = 0.42 how do you solve ____ Algebraic division problems like th 4 This???? Please help!! Hduyeuridudufudycififufhdhcievkx

KatRina [158]

Answer:

$X=0.92$

Step-by-step explanation:

$X-\frac{1}{2} = 0.42\\$

Converting fraction into decimal.

$X-0.5=0.42$

Adding both side by 0.5

$X-0.5+0.5= 0.42+0.5\\\\X= 0.92$

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3 years ago

Alexa is buying lace to sew around the edge of a round tablecloth. The radius of the tablecloth is 2 3/4 feet. If lace is sold b

sergey [27]

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3 0

3 years ago