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2 years ago

Three times a number plus five equal twenty

Mathematics

1 answer:

Bezzdna [24]2 years ago

3 0

Let the number be x
3x + 5 = 20
3x = 20 - 5
x = 15/3
x=5

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A random sample of 77 fields of durum wheat has a mean yield of 27.427.4 bushels per acre and standard deviation of 5.755.75 bus

xz_007 [3.2K]

Answer:

[ 21.79, 33.0 ]

Step-by-step explanation:

Given:

Sample size, n = 7

Sample mean, μ = 27.4

Standard deviation, σ = 5.75

Confidence level is 99%

also, population is normal i.e normally distributed

Thus,

Confidence interval = μ ± $z\frac{\sigma}{\sqrt n}$

For confidence level of 99%

z-value = 2.58

Therefore,

Lower limit of Confidence interval = μ - $2.58\times\frac{5.75}{\sqrt{7}}$

Lower limit of Confidence interval = 27.4 - $2.58\times\frac{5.75}{\sqrt{7}}$

Lower limit of Confidence interval = 21.79

Upper limit of Confidence interval = μ + $2.58\times\frac{5.75}{\sqrt{7}}$

Upper limit of Confidence interval = 27.4 + $2.58\times\frac{5.75}{\sqrt{7}}$

Upper limit of Confidence interval = 33.00

Hence, confidence interval = [ 21.79, 33.0 ]

5 0

3 years ago

What is 1650 increased by 99%

11Alexandr11 [23.1K]

3283.5 i think increased means more so i just added them together

6 0

3 years ago

What 2 numbers equals the sum of 42 and the quotient of 3

Shalnov [3]

$x+y=42 \\ \frac{x}{y} =3$

$y=-x+42 \\ \frac{x}{-x+42} =3 \\ x=3(-x+42)\\ x=-3x+126\\4x=126\\x= \frac{126}{4} \\x=31.5$

$x+y=42 \\ 31.5+y=42\\ y=42-31.5\\y=10.5$

The numbers are 31.5 and 10.5

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3 years ago

Read 2 more answers

Marking braniest<br><br> i have no idea how to do this

kondor19780726 [428]

Answer:

A = increasing ( positive slope )

D = increasing ( positive slope )

C = decreasing ( negative slope )

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If number on y-axis increases with increase of x then it is increasing.

If number on y-axis decreases with increase of x then it is decreasing.

If number on y-axis stays the same with increase of x then it is constant.

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2 years ago

What has the Same algebraic expression as 9(3x-3)

seraphim [82]

Answer:

27x-27

Step-by-step explanation:

9×3x=27x

9×3=27

27x-27

6 0

2 years ago