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3 years ago

Let a Δ b = (a+b)2+5. what is 1 Δ - 4?

Mathematics

1 answer:

Arturiano [62]3 years ago

5 0

It looks like ∆ is defined as

a ∆ b = (a + b)² + 5

If that's the case, then

1 ∆ (-4) = (1 + (-4))² + 5 = (-3)² + 5 = 9 + 5 = 14

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Round 290951.867863 to the nearest hundred.

andreev551 [17]

Answer: 290951.87

Step-by-step explanation:

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2 years ago

Jada is designing two new paths leading from park entrances to a fountain near the center of the park.

Dmitry_Shevchenko [17]

Is there a question?

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3 years ago

Item 12

zlopas [31]

Answer: about 14pi inches

Explanation:

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3 years ago

Find the minimum sample size needed to estimate the percentage of Democrats who have a sibling. Use a 0.1 margin of error, use a

Brums [2.3K]

Answer:

The minimum sample size is $n =135$

Step-by-step explanation:

From the question we are told that

The confidence interval is $( lower \ limit = \ 0.44,\ \ \ upper \ limit = \ 0.51)$

The margin of error is $E = 0.1$

Generally the sample proportion can be mathematically evaluated as

$\r p = \frac{ upper \ limit + lower \ limit }{2}$

$\r p = \frac{ 0.51 + 0.44}{2}$

$\r p = 0.475$

Given that the confidence level is 98% then the level of significance can be mathematically evaluated as

$\alpha = 100 - 98$

$\alpha = 2\%$

$\alpha =0.02$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table

The value is

$Z_{\frac{\alpha }{2} } = 2.33$

Generally the minimum sample size is evaluated as

$n =[ \frac { Z_{\frac{\alpha }{2} }}{E} ]^2 * \r p (1- \r p )$

$n =[ \frac { 2.33}{0.1} ]^2 * 0.475(1- 0.475 )$

$n =135$

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3 years ago

DIRECTIONS: Use this information to answer Parts A and B.

sleet_krkn [62]

Answer:

$17,160

Step-by-step explanation:

286,000·0.06=17,160

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3 years ago