All categories

3 years ago

What’s the sum of 20x^2-10x-30

Mathematics

2 answers:

Vladimir [108]3 years ago

8 0

10(x+1)(2x−3) I think

Veronika [31]3 years ago

7 0

10(x1)(2x-3) I think

You might be interested in

In a random sample of 8 people, the mean commute time to work was 33.5 minutes and the standard deviation was 7.2 minutes. A 95

Elina [12.6K]

Answer: Margin of error = 6.58

Confidence interval = (26.91, 40.08)

Step-by-step explanation:

Since we have given that

Sample size n = 8

Sample mean = 33.5 minutes

Population standard deviation = 9.5 minutes

At 95% confidence interval,

α = 0.05

t = 1.96

So, Margin of error is given by

$t\times \dfrac{\sigma}{\sqrt{n}}\\\\=1.96\times \dfrac{9.5}{\sqrt{8}}\\\\=6.58$

Confidence interval would be

Lower limit:

$\bar{x}-6.58\\\\=33.5-6.58\\\\=26.91$

Upper limit:

$\bar{x}+6.58\\\\=33.5+6.58\\\\=40.08$

Hence, the interval would be (26.91, 40.08)

But at standard deviation 7.2 minutes, the confidence interval was (27.5, 39.5)

Confidence interval using the standard normal distribution is wider than the confidence interval using t distribution.

3 0

2 years ago

PLESE HELP I WILL MARK BRAINEST PLEASE

FrozenT [24]

Answer:

a) 23.0769% increase

b) 9.375% decrease

Step-by-step explanation:

7 0

3 years ago

Please i need help for all of them!!

lianna [129]

Answer:

1) x=65

2) x= 70

3) x= 40

4) x= 131

5) x= 75

6) x= 49

7) x= -12

8) x= 42

3 0

3 years ago

Help read the instructions ffirst

Nezavi [6.7K]

Answer:

Step-by-step explanation:

Find attached the first sum.

x denotes horizontal and y denotes vertical

When the value of x is positive, it moves to right side and when x is negative, it moves left sides 'x unit'

When the value of y is positive, it moves to up side and when y is negative, it moves down sides 'y unit'

7 0

2 years ago

What are the coordinates of point B' if the translation vector (7,-5) is applied to tríangle ABC to produce the image triangle A

guajiro [1.7K]

Answer:

A. -1,2

Step-by-step explanation:

take point B move it 7 units (positive) across the x axis then from there 5 units (negative) down. That point lands on (-1,2) so B’ has the new point of that

5 0

2 years ago