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3 years ago

Which is not equal to the absolute value of -1?

Mathematics

1 answer:

timurjin [86]3 years ago

5 0

Answer:

-2

Step-by-step explanation:

Absolute value is the distance from a number to 0 on the number line, so the number can't be negative, only positive. The absolute value of -1 would be 1, therefore it couldn't be -2, or any other negative numbers.

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What is x2 + 2x + 9 = 0

vova2212 [387]

Answer:

x has no real solution

Step-by-step explanation:

Our equation is qudratic equation so the method we will follow to solve it is using the dicriminant :

Let Δ be the dicriminant
a=1
b=2
c=9
Δ= 2²-4*1*9 =4-36=-32
we notice that Δ≤0⇒x has no real solution

4 0

3 years ago

What are the minimum, first quartile, 20 70 13 15 23 17 40 51

malfutka [58]

Answer:

Minimum 13

First quartile 16

Step-by-step explanation:

Rewrite the sample 20 70 13 15 23 17 40 51 in ascending order:

13 15 17 20 23 40 51 70

The minimum is 13.

The median is the middle number

13 15 17 20 23 40 51 70

The middle number between 20 and 23 is

$\dfrac{20+23}{2}=21.5$

Consider first half of the sample

13 15 17 20

The first quartile is the middle number of this part. The middle number of

13 15 17 20

$\dfrac{15+17}{2}=16$

7 0

3 years ago

The mean per capita income is 15,451 dollars per annum with a variance of 298,116. What is the probability that the sample mean

docker41 [41]

Answer: 0.5467

Step-by-step explanation:

Let X be the random variable that represents the income (in dollars) of a randomly selected person.

Given : $\mu=15451$

$\sigma^2=298116\\\\\Rightarrow\ \sigma=\sqrt{298116}=546$

Sample size : n=350

z-score : $\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

To find the probability that the sample mean would differ from the true mean by less than 22 dollars, the interval will be

$\mu-22,\ \mu+22\\\\=15,451 -22,\ 15,451 +22\\\\=15429,\ 15473$

For x=15429

$z=\dfrac{15429-15451}{\dfrac{546}{\sqrt{350}}}\approx-0.75$

For x=15473

$z=\dfrac{15473-15451}{\dfrac{546}{\sqrt{350}}}\approx0.75$

The required probability :-

$P(15429$

Hence, the required probability is 0.5467.

3 0

3 years ago

How do I solve this problem

andriy [413]

Answer:

-0.80% 866hh ftt to be a member states that

7 0

3 years ago

Jacob bought 7 t-shirts for $32.90. Gwen bought 12 t-shirts for $60. Their friend Lia found a store online where she can buy a p

andrew-mc [135]

Answer:

$37.60

Step-by-step explanation:

If 7 shirts = 32.90 then (32.90/7) x 8 = 37.60

6 0

3 years ago