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3 years ago

4n+?=20 please help me

Mathematics

2 answers:

patriot [66]3 years ago

8 0

4×2=8 so n=2 and 8+12=20 so ?=12

dexar [7]3 years ago

4 0

Put. -4n+20 in the ? Because 4n+?=20
4n+ -4n+20=20
The 4n cancel and both sides equal 20 for the check

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The table shows the results of a survey in which 10th-grade students were asked how many siblings (brothers and/or sisters) they

lesantik [10]

Answer:

70%

Step-by-step explanation:

Given

Number of Siblings: || 0 || 1 || 2 || 3

Number of Students: || 4 || 18 || 10 || 8

Required

Determine the probability of a student having at least one but not more than 2 siblings

First, we have to determine the total number of 10th grade students

$Total = 4 + 18 + 10 + 8$

$Total = 40$

The probability of a student having at least one but not more than 2 siblings = P(1) + P(2)

Solving for P(1)

P(1) = number of students with 1 sibling / total number of students

From the given parameters, we have that:

Number of students with 1 sibling = 18

So:

$P(1) = \frac{18}{40}$

Solving for P(2)

P(2) = number of students with 2 siblings / total number of students

From the given parameters, we have that:

Number of students with 2 siblings = 10

So:

$P(2) = \frac{10}{40}$

$P(1) + P(2) = \frac{18}{40} + \frac{10}{40}$

Take LCM

$P(1) + P(2) = \frac{18 + 10}{40}$

$P(1) + P(2) = \frac{28}{40}$

Divide numerator and denominator by 4

$P(1) + P(2) = \frac{7}{10}$

$P(1) + P(2) = 0.7$

Convert to percentage

$P(1) + P(2) = 70\%$

Hence, the required probability is 70%

6 0

3 years ago

K/8+7=19 solve for k

Slav-nsk [51]

Hello.

k / 8 + 7 = 19, The value of k is 96.

6 0

3 years ago

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Draw and label the circle given by the equation (x - 5 + y + 10 = 6^2

Oxana [17]

Answer:

See attachment for circle

Step-by-step explanation:

Given

$(x -5)^2 + (y + 10)^2 = 6^2$

Required

Draw and label the circle

The equation of a circle is:

$(x -a)^2 + (y - b)^2 = r^2$

Where:

$Center = (a,b)$

$Radius = r$

So, we have:

$Center = (5,-10)$

$Radius = 6$

See attachment for circle

7 0

3 years ago

I need this answer ASAP

lana [24]

Answer:

Step-by-step explanation:

Multiply 13*5 is 65

4 0

3 years ago

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A random variable x is normally distributed with a mean of 100 and a variance of 25. Given that x = 110, its corresponding z- sc

Rashid [163]

A random variable x is normally distributed with a mean of 100 and a variance of 25. Given that x = 110, its corresponding z- score is 0.40.

Answer: The given z-score is false.

Explanation: We are given:

Mean, $\mu=100$ ,

Variance, $\sigma^{2}=25$

$\therefore\sigma=\sqrt{\sigma^{2}}$

$=\sqrt{25}$

$=5$

The z-score formula is given below:

$z=\frac{x-\mu}{\sigma}$

$=\frac{110-100}{5}$

$=\frac{10}{5}$

$=2$

Therefore, the z-score corresponding x=100 is 2

Therefore, the given z-score = 0.4 is false.

4 0

4 years ago