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3 years ago

13

A 8.5 B 8.1 C 12.5 D 12.9

1 answer:

elena55 [62]3 years ago

4 0

Cosine again. Yay.

Put 36 into a fancy calculator with one of those cos() things. You get about 0.81.

So that's the ratio between x and 10.

So basically x/10 = 0.81, or 0.81 * 10 = x.

8.1 = x

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An item is priced at $13.55. If the sales tax is 4%, what does the item cost including sales tax? A. $0.54 B. $18.97 C. $14.09 D

Natasha_Volkova [10]

How To Solve It:

$13.55 x 0.04 = 0.54

$13.55 + 0.54 = $14.09

Answer:

$14.09

I hope this helps! :)

7 0

3 years ago

Read 2 more answers

Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

blsea [12.9K]

Answer:

a) Percentage of students scored below 300 is 1.79%.

b) Score puts someone in the 90th percentile is 638.

Step-by-step explanation:

Given : Suppose a student's score on a standardize test to be a continuous random variable whose distribution follows the Normal curve.

(a) If the average test score is 510 with a standard deviation of 100 points.

To find : What percentage of students scored below 300 ?

Solution :

Mean $\mu=510$ ,

Standard deviation $\sigma=100$

Sample mean $x=300$

Percentage of students scored below 300 is given by,

$P(Z\leq \frac{x-\mu}{\sigma})\times 100$

$=P(Z\leq \frac{300-510}{100})\times 100$

$=P(Z\leq \frac{-210}{100})\times 100$

$=P(Z\leq-2.1)\times 100$

$=0.0179\times 100$

$=1.79\%$

Percentage of students scored below 300 is 1.79%.

(b) What score puts someone in the 90th percentile?

90th percentile is such that,

$P(x\leq t)=0.90$

Now, $P(\frac{x-\mu}{\sigma} < \frac{t-\mu}{\sigma})=0.90$

$P(Z< \frac{t-\mu}{\sigma})=0.90$

$\frac{t-\mu}{\sigma}=1.28$

$\frac{t-510}{100}=1.28$

$t-510=128$

$t=128+510$

$t=638$

Score puts someone in the 90th percentile is 638.

5 0

3 years ago

N is an integer, write down the values of n such that -15<3n<6

Ira Lisetskai [31]

-15 < 3n < 6

Divide all sides by 3

-5 < n < 2

Now you need all integers between -5 and 2.

-4, -3, -2, -1, 0, 1

3 0

3 years ago

2(3-8y)= Apply the distributive property to create an equivalent expression.

umka2103 [35]

Answer:

$6-16y$

Step-by-step explanation:

$2(3-8y)\\\\\boxed{6-16y}\\\\\\\left \{ {{2*3=6} \atop {2*-8y=-16y}} \right.$

Hope this helps.

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3 years ago

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What angle is complementary to 2 ?

Zarrin [17]

Answer:

number 4 i gess

Step-by-step explanation:

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3 years ago

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