Which expression is NOT equivalent to 15.-2?

Mathematics

1 answer:

castortr0y [4]3 years ago

7 0

Answer:

As far as I can tell, the answer's the second one! (-2+)!

Step-by-step explanation:

(+3+3) AKA 3+3=6. Not -2

(-2+) AKA -2. Is -2!

(-2+ ) AKA -2+?. Could answer -2 but the space after the positive sign concerned me enough to cross it as not -2...

-3 +15 AKA -3+15=12. Not -2.

-2 +15 AKA -2+15=13. Not -2.

-2 - 15 - 2 AKA -2-15-2=13. Not -2.

There's my answer but since it has weird options with how each is given, I could be wrong? Not 100% sure but it's worth the try! Please mark me brainliest if I'm correct!

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3(b - 15) =9 solve for b

shepuryov [24]

B = 18 because 18-5 is equal to 3 and 3x3 is equal to 9.

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3 years ago

According to the last census (2010), the mean number of people per household in the United States is LaTeX: \mu = 2.58 Assume a

Veseljchak [2.6K]

Answer:

P(2.50 < Xbar < 2.66) = 0.046

Step-by-step explanation:

We are given that Population Mean, $\mu$ = 2.58 and Standard deviation, $\sigma$ = 0.75

Also, a random sample (n) of 110 households is taken.

Let Xbar = sample mean household size

The z score probability distribution for sample mean is give by;

Z = $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

So, probability that the sample mean household size is between 2.50 and 2.66 people = P(2.50 < Xbar < 2.66)

P(2.50 < Xbar < 2.66) = P(Xbar < 2.66) - P(Xbar $\leq$ 2.50)

P(Xbar < 2.66) = P( $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ < $\frac{2.66-2.78}{\frac{0.75}{\sqrt{110} } }$ ) = P(Z < -1.68) = 1 - P(Z 1.68)

= 1 - 0.95352 = 0.04648

P(Xbar $\leq$ 2.50) = P( $\frac{Xbar-\mu}{\frac{\sigma}{\sqrt{n} } }$ $\leq$ $\frac{2.50-2.78}{\frac{0.75}{\sqrt{110} } }$ ) = P(Z $\leq$ -3.92) = 1 - P(Z < 3.92)