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4 years ago

Three medium pizzas cost $10.50. How much does it cost to buy 10 medium pizzas?

Mathematics

1 answer:

Mars2501 [29]4 years ago

3 0

Answer:

$35

Step-by-step explanation:

i used calculator

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The slope of the line is

Vesna [10]

Answer:

The slope is 0

Step-by-step explanation:

If the line is horizontal then it's 0

3 0

3 years ago

Element X is a radioactive isotope such that its mass decreases by 67% every year. If

sattari [20]

Answer:

Step-by-step explanation:

X is mass which I s decrease. If you have 740 grams of element x and you add the function.per the rate day you will have a hundredth percent.

8 0

3 years ago

What should a size of a sample be in order to have a margin of error of 4% for a 90% confidence level from a population with a s

vagabundo [1.1K]

Answer:

We need a sample size of 2,071,800 or higher.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, we find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

In this problem:

We need a sample size of n or higher, when $M = 0.04, \sigma = 35$ . So

$M = z*\frac{\sigma}{\sqrt{n}}$

$0.04 = 1.645*\frac{35}{\sqrt{n}}$

$0.04\sqrt{n} = 1.645*35$

$0.04\sqrt{n} = 57.575$

$\sqrt{n} = 1439.375$

$\sqrt{n}^{2} = (1439.375)^{2}$

$n = 2,071,800$

We need a sample size of 2,071,800 or higher.

6 0

3 years ago

Solve simultaneous equation 2x + 4y = 1 3x-5y=7

ikadub [295]

2x + 4y = 1 ⇒ 6x + 12y = 3
3x - 5y = 7 ⇒ 6x - 10y = 14
 22y = 17
 22 22
 y = 17/22
 2x + 4(17/22) = 1
 2x + 3 1/11 = 1
 -3 1/11 -3 1/11
 2x = -2 1/11
 2 2
 x = -1 1/22
 (x y) = (-1 1/22, 17/22)

4 0

3 years ago

The distance from Earth to the moon is 2.39 × 105 miles, and the distance from Earth to Mercury is 9.2 × 107 miles. Approximatel

malfutka [58]

Answer:

(D) 400

Step-by-step explanation:

It is given that The distance from Earth to the moon is 2.39 × 105 miles, and the distance from Earth to Mercury is 9.2 × 107 miles. Then,

Distance from Earth to Mercury compared to the distance from Earth to the moon is given by:

$\frac{distance from Earth to Mercury}{distance from Earth to the moon}=\frac{9.2{\times}10^7}{2.39{\times}10^5}$

= $3.849{\times}10^2$

= $384.9$

≈400.

therefore, option D is correct.

5 0

3 years ago