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3 years ago

A, b, c, or d? i need helpsjdndnd

Mathematics

2 answers:

horrorfan [7]3 years ago

5 0

Answer:

D is the correct choice.

Step-by-step explanation:

77julia77 [94]3 years ago

3 0

Answer:

d, I think

Step-by-step explanation:

absolute val of 5 is greater than absolute val of 4

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A random sample of 146 recent donations at a certain blood bank reveals that 81 were type A blood. Does this suggest that the ac

Tju [1.3M]

Answer:

We reject H₀ the actual percentage of type A donations differs from 40%

Step-by-step explanation:

Sample information:

sample size n = 146

Type A x₁ = 81 and p₁ = 81 / 146 p₁ = 0,5547

then q₁ = 1 - p₁ q₁ = 1 - 0,5547 q₁ = 0,4453

We choose as significance level α = 5% α = 0,05 α /2 = 0,025

from z-table we find z (c) = 1,96

National % of the population ( μ = 40 % μ = 0,4 )

Test hypothesis

Null hypothesis H₀ p₁ = μ

Alternative Hypothesis Hₐ p₁ ≠ μ

The Alternative hypothesis indicates that the test is a two-tail test

z(s) = ( p₁ - μ )/ √ p₁*q₁ / n

z(s) = ( 0,5547 - 0,40 )/ √ 0,5547*0,4453 / 146

z(s) = 0,1547 / 0,041

z(s) = 3,77

Comparing z(s) and z(c)

z(s) > z(c)

z(s) is in the rejection region. We reject H₀. Sample does not give evidence to support that the actual percentage of type A donations is equal to the national population

6 0

3 years ago

Which would not be a step in solving 18=2(4+ x)

mr_godi [17]

Answer:

Step-by-step explanation:

Done on apex

8 0

4 years ago

Solve 3x2 = −12x − 15. x = −4 ± 2i x = −4 ± i x = −2 ± 2i x = −2 ± i

diamong [38]

ANSWER

$x = - 2 \pm i$

EXPLANATION

We use the method of completing the squares.

The equation is
$3 {x}^{2} = - 12x - 15$

We rewrite the above equation to obtain;

$3 {x}^{2} + 12x = - 15$

We divide through by 3 to obtain;

${x}^{2} + 4x = - 5$

We add half the coefficient of
$x$

to both sides of the equation to get,

${x}^{2} + 4x + {2}^{2} = - 5 + {2}^{2}$

The right hand side is now a perfect square.

${(x + 2)}^{2} = - 1$

We now take square root of both sides to get;

$x + 2 = \pm \sqrt{ - 1}$

We add -2 to both sides,

$x = - 2 \pm \sqrt{ - 1}$

We simplify to obtain,

$x = - 2 \pm i$

3 0

3 years ago

Evaluate: 10x when x=10 The answer is_______( just type in your final number answer)

Kisachek [45]

Answer:

100

Step-by-step explanation:

5 0

3 years ago

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Evaluating to Determine Equivalent Expressions

ruslelena [56]

Answer:

:photo

Step-by-step explanation:

7 0

3 years ago