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Bad White [126]
3 years ago
5

What does n equal in 5n +3(n - 4) = 60

Mathematics
2 answers:
EastWind [94]3 years ago
7 0

Answer:

n=9

Step-by-step explanation:

use the distributive property of multiplication

5n+3(n-4)=60

5n+3n-12=60

combine like terms

5n+3n-12=60

8n-12=60

add 12 to each side

8n-12=60

    +12  +12

8n=72

then lastly divide by 8 on both sides

8n=72

/8    /8

n=9

dalvyx [7]3 years ago
6 0

Answer:

n = 9

good luck

Step-by-step explanation:

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What number can cancel 15 and 10​
Lena [83]

Answer:

Step-by-step explanation:

5 can cancel

5 0
3 years ago
There are 1250 students at Cypress Middle School. 42% of the students are enrolled in PE.
Luden [163]

Answer:

525

Step-by-step explanation:

multiply 1250 by the decimal form of the percentage (42% turns to .42)

4 0
2 years ago
The number of texts per day by students in a class is normally distributed with a 
kobusy [5.1K]

Answer:

1, 2, 6

Step-by-step explanation:

The z score shows by how many standard deviations the raw score is above or below the mean. The z score is given by:

z=\frac{x-\mu}{\sigma} \\\\where\ x=raw\ score,\mu=mean, \ \sigma=standard\ deviation

Given that mean (μ) = 130 texts, standard deviation (σ) = 20 texts

1) For x < 90:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{90-130}{20} =-2

From the normal distribution table, P(x < 90) = P(z < -2) = 0.0228 = 2.28%

Option 1 is correct

2) For x > 130:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{130-130}{20} =0

From the normal distribution table, P(x > 130) = P(z > 0) = 1 - P(z < 0) = 1 - 0.5 = 50%

Option 2 is correct

3) For x > 190:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{190-130}{20} =3

From the normal distribution table, P(x > 3) = P(z > 3) = 1 - P(z < 3) = 1 - 0.9987 = 0.0013 = 0.13%

Option 3 is incorrect

4)  For x < 130:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{130-130}{20} =0

For x > 100:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{100-130}{20} =-1.5

From the normal table, P(100 < x < 130) = P(-1.5 < z < 0) = P(z < 0) - P(z < 1.5) = 0.5 - 0.0668 = 0.9332 = 93.32%

Option 4 is incorrect

5)  For x = 130:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{130-130}{20} =0

Option 5 is incorrect

6)  For x = 130:

z=\frac{x-\mu}{\sigma} \\\\z=\frac{160-130}{20} =1.5

Since 1.5 is between 1 and 2, option 6 is correct

5 0
3 years ago
Charles is 20% heavier than Edith. If Charles weighs 60kg, what is Edith's weight?​
ddd [48]

Charles' weight = Edith's weight + 20% of Edith's weight

We'll use a variable to represent Edith's weight, x.

The decimal form of 20% is 0.2.

60 = x + 0.2x

60 = 1.2x

x = 50

Edith's weight is 50kg.

Hope this helps!

4 0
1 year ago
What is the value of c so that 9x^2 + 15x + c = 0 has one rational solution
valentinak56 [21]

Answer:

c=-9x^2-15x

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
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