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AfilCa [17]
3 years ago
6

Which is equivalent to (3 + 2i)(3 + 2i)

Mathematics
1 answer:
Olegator [25]3 years ago
4 0
(3+2i) squared I think
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3 times a certain number n is added to 6, the sum is 20 more than the original
Vikentia [17]

Answer:

n = 5.33→

Step-by-step explanation:

4 0
3 years ago
Chicken Delight claims that 87% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 80 or
jeka57 [31]

Answer:

There is strong evidence that less than 87% of the orders are delivered in less than 10 minutes.

Decision rule: Reject the null hypothesis if (P-value < level of significance)

Test statistic z=-2.70

Decision: Reject the null hypothesis (0.003<0.010)

Step-by-step explanation:

In this question we have to test an hypothesis.

The null and alternative hypothesis are:

H_0: \pi\geq0.87\\\\H_a:\pi

The significance level is assumed to be 0.01.

The sample of size n=80 gives a proportion of p=61/80=0.7625.

The standard deviation is:

\sigma=\sqrt{\frac{\pi(1-\pi)}{N} }=\sqrt{\frac{0.87*0.13}{80} }=0.0376

The statistic z is then

z=\frac{p-\pi+0.5/N}{\sigma}=\frac{0.7625-0.87+0.5/80}{0.0376} } =\frac{-10125}{0.0376} =-2.70

The P-value is

P(z

The P-value (0.003) is smaller than the significance level (0.010), so the effect is significant. The null hypothesis is rejected.

There is strong evidence that less than 87% of the orders are delivered in less than 10 minutes.

Decision rule: Reject the null hypothesis if (P-value < level of significance)

Test statistic z=-2.70

Decision: Reject the null hypothesis (0.003<0.010)

6 0
3 years ago
The area of a rectangle is 440 square inches. The length of the rectangle is 29 inches more than its width. What is the length o
Andreyy89
The length of regtangle is 40 inches
3 0
3 years ago
Help please.<br> Algebra.
Yanka [14]

Answer:

I'm pretty sure Its D i think-

7 0
2 years ago
What's the reciprocal of 2/3
jonny [76]
0.16666666666 that is correct
8 0
2 years ago
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