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olasank [31]
2 years ago
14

Add, subtract, multiply, or divide. Can someone help me please.​

Mathematics
2 answers:
777dan777 [17]2 years ago
5 0
Number 7 is subtract
Varvara68 [4.7K]2 years ago
4 0

<u><em>7</em></u>:  8+(-4)=-2

<u><em>8</em></u>:  -7+2=-5

<u><em>9</em></u>:  -11-7=-18

<u><em>10</em></u>:  12÷(-6)=-2

<u><em>11</em></u>:   -9×(-3)=27

<em><u>12</u></em>:  4-(-3)=7

<em><u>13</u></em>:  -45÷9=-5

<u><em>14</em></u>:   6×(-3)=-18

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zysi [14]

7,159=s problem A

8,946-7,150=1,796 Problem B

This is reasonable because I did everything step by step Problem C

Problem 1. the answer is 4,307+1,614=5,921

Problem 2. the answer is 5,036-2,149=2,887

Step-by-step explanation:

hope this helps and hope you work it out with your mom

7 0
2 years ago
Crop researchers plant 15 plots with a new variety of corn. The yields in bushels per acre are: 138.0 139.1 113.0 132.5 140.7 10
son4ous [18]
There is a relationship between confidence interval and standard deviation:
\theta=\overline{x} \pm \frac{z\sigma}{\sqrt{n}}
Where \overline{x} is the mean, \sigma is standard deviation, and n is number of data points.
Every confidence interval has associated z value. This can be found online.
We need to find the standard deviation first: 
\sigma=\sqrt{\frac{\sum(x-\overline{x})^2}{n}
When we do all the calculations we find that:
\overline{x}=123.8\\ \sigma=11.84
Now we can find confidence intervals:
($90\%,z=1.645): \theta=123.8 \pm \frac{1.645\cdot 11.84}{\sqrt{15}}=123.8 \pm5.0\\($95\%,z=1.960): \theta=123.8 \pm \frac{1.960\cdot 11.84}{\sqrt{15}}=123.8 \pm 5.99\\ ($99\%,z=2.576): \theta=123.8 \pm \frac{2.576\cdot 11.84}{\sqrt{15}}=123.8 \pm 7.87\\
We can see that as confidence interval increases so does the error margin. Z values accociated with each confidence intreval also get bigger as confidence interval increases.
Here is the link to the spreadsheet with standard deviation calculation:
https://docs.google.com/spreadsheets/d/1pnsJIrM_lmQKAGRJvduiHzjg9mYvLgpsCqCoGYvR5Us/edit?usp=sharing
6 0
3 years ago
Which statement is true about the discontinuities of the function f(x)?
Leno4ka [110]

Answer:

  (a)  There are asymptotes at x=3/2 and x=-1/3

Step-by-step explanation:

The denominator zeros can be found by factoring:

  f(x) = (x +1)/((2x -3)(3x +1))

Neither of the denominator factors is cancelled by the numerator factor, so each represents a vertical asyptote, not a function hole.

The asymptotes are at the values of x where the denominator is zero:

  2x -3 = 0   ⇒   x = 3/2

  3x +1 = 0   ⇒   x = -1/3

8 0
2 years ago
HELP PLEASE! ASAP ! <br> These 2 questions !
Vlad1618 [11]

Answer: 9 is true, 10 is false

Step-by-step explanation:

The key to these problems is to make sure the sequence of the letters is equal: 10 would be correct if they said DF ≅XZ

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2 years ago
Kerry is planning to plant a rectangular garden that is 16 feet longer than it wide. Kerry wants to find its width if its area i
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I think it is A. I hope Im correct.
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3 years ago
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