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Marrrta [24]
3 years ago
8

5 concrete blocks form one-eighth of a structure. So how many concrete blocks are

Mathematics
2 answers:
Assoli18 [71]3 years ago
6 0

Answer:

40 blocks

Step-by-step explanation:

5 = 1/8 of x

multiply by reciprocal of (1/8) = 8

5(8) = x

x = 40

40 blocks

Vladimir [108]3 years ago
3 0

Answer:

40

Step-by-step explanation:

5= 1/8 of structure so 5*8= 8/8 of the structure= 40

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A homeowner is installing a swimming pool. You have been asked to install a circuit to operate a 600-watt underwater light and a
insens350 [35]

Answer:

The answer is given below

Step-by-step explanation:

The loads in the circuit are continuous duty, so the circuit can only loaded to 80% of its current rating.

Calculate 80% current rating of the circuit breaker.

Icb = [ 80/100] (20 A)

     =  (O.8) (20 A )

     = 16 A

Now we assume that the value of supply voltage is 120 V

Now we will calculate current flows via under water light which will be taken as  Load 1

<em>Ii = </em>500 W/120 V

  = 4.167 A

Current via the circulating pump which will be taken as Load 2 IS 8.5 A

<em>I = </em>load1 + load 2

<em>    = 4.167 A + 8.5 A</em>

<em>   = 12.67 A</em>

The total current in the circuit obtained which is less than the circuit breaker rating current. Therefore, the power can be operated for both the loads.

3 0
3 years ago
Which ordered pair is a solution to the system of inequalities
Mademuasel [1]

Answer:

A

Step-by-step explanation:

i took the test

8 0
2 years ago
Find the standard form of the equation of the parabola with a focus at (-7, 0) and a directrix at x = 7.
Volgvan

x = 1/(4p)*y^2

x = 1/(4*-7)*y^2

x = -1/28*y^2

8 0
3 years ago
Read 2 more answers
To bake muffins,. Matt needs x eggs for every 200 grams of flour. If he used 900 grams of flour, how many eggs did he use
JulsSmile [24]
I Can't Figure That Out, Because X Is Unknown. So I Still Don't Know If He Used 900 Grams Of Flower, How Many Eggs He Used. The Answer Is X, Since We Don't Know How Much X Is.
5 0
3 years ago
In a given year, the average annual salary of a NFL football player was $189,000 with a standard deviation of $20,500. If a samp
nika2105 [10]

Answer:

15.15% probability that the sample mean will be $192,000 or more.

Step-by-step explanation:

To solve this problem, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a random variable X, with mean \mu and standard deviation \sigma, a large sample size can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}

In this problem, we have that:

\mu = 189000, \sigma = 20500, n = 50, s = \frac{20500}{\sqrt{50}} = 2899.14

The probability that the sample mean will be $192,000 or more is

This is 1 subtracted by the pvalue of z when X = 192000. So

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{192000 - 189000}{2899.14}

Z = 1.03

Z = 1.03 has a pvalue of 0.8485.

1-0.8485 = 0.1515

15.15% probability that the sample mean will be $192,000 or more.

7 0
2 years ago
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