3 years ago

Solve the equation: 1/2x^2 + x when x = 4

Mathematics

1 answer:

lesya [120]3 years ago

5 0

Answer:

Step-by-step explanation:

1/2(x^2 + x) x=4

1/2(4^2+4)

1/2(16+4)

1/2 x 20

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A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtain

slega [8]

Answer: 8359

Step-by-step explanation:

The formula for sample size needed for interval estimate of population proportion :-

$n=p(1-p)(\frac{z_{\alpha/2}}{E})^2$

Given : The significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}}=z_{0.025}=\pm1.96$

Previous estimate of proportion : $p=0.32$

Margin of error : $E=0.01$

Now, the required sample size will be :-

$n=0.32(1-0.32)(\frac{1.96}{0.01})^2=8359.3216\approx8359$

Hence, the required sample size = 8359

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2 years ago

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creativ13 [48]

Answer:

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2 years ago

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A day care facility is open six days a week. The numbers of children who

Igoryamba

Answer:

Step-by-step explanation:

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2 years ago

Exactly 120 tickets were sold for a concert. The tickets cost $12 each for adults, $10 each for seniors, and $6 each for childre

Gemiola [76]

A=adult tickets
c=chlderenticekts
s=sinior tickets

a=c

a+c+s=120
2a+s=120

total made is 1100
12a+6c+10s=1100
sub
a=c
12a+6a+10s=1100
add
18a+10s=1100

multiply first equation by -9 and add to other equation

-18a-9s=-1080
18a+10s=1100 +
0a+s=20

s=20
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answer is B

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3 years ago

Jaxon bought a book for $6 and 5 movies. He spent a total of $41. How much did each movie cost?

Vsevolod [243]

Answer: each movie costs 7$

Step-by-step explanation: 41-6=35 and you divide that by 5 which is 7

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2 years ago

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