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3 years ago

What what are the rules for addition and subtraction with numbers in scientific notation?

1 answer:

5 0

Addition and Subtraction in Scientific Notation. A number written in scientific notation is written as the product of a number between 1 and 10 and a number that is a power of 10. That is, it is written as a quantity whose coefficient is between 1 and 10 and whose base is 10.

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Which of the following shows a reflection of the triangle over the horizontal axis?

Ne4ueva [31]

Answer:

I think the first one is the answer

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3 years ago

F(x) = x2 - 5

marysya [2.9K]

Answer:

[-1, 3, 9]

Step-by-step explanation:

when x = 2: 4-5 = -1

when x = 4: 8-5 = 3

when x = 7: 14-5 = 9

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4 years ago

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Which of the following probabilities is the greatest for a standard normal distribution? P (negative 1.5 less-than-or-equal-to z

hichkok12 [17]

Answer:

Step-by-step explanation:

I hope that answered your question

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3 years ago

Suppose we want a 90% confidence interval for the average amount of time (in minutes) spent per week on homework by the students

ki77a [65]

Answer: 482

Step-by-step explanation:

Formula to find the sample size is given by :-

$n= (\dfrac{z^*\times \sigma}{E})^2$ (1)

, where z* = critical z-value (two tailed).

$\sigma$ = Population standard deviation and E = Margin of error.

As per given , we have

Margin of error : E= 3

$\sigma=40$

Confidence level = 90%

Significance level = $\alpha=1-0.90=0.10$

Using z-table , the critical value for 90% confidence= $z^*=z_{\alpha/2}=z_{0.05}=1.645$

Required minimum sample size = $n= (\dfrac{(1.645)\times (40)}{3})^2$ [Substitute the values in formula (1)]

$n=(21.9333333333)^2$

$n=481.07111111\approx482$ [ Round to the next integer]

Hence, the number of observations required is closest to 482.

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4 years ago

Can someone please help me with question #3 plz, I'll appreciate it:)

Rufina [12.5K]

(4.55 x 10^13)-(1.78 x 10^12)=4.372 x 10^13

     45500000000000
-    1780000000000
-----------------------------
     43720000000000 or 4.372 x 10^13

3 0

3 years ago

Read 2 more answers