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Artyom0805 [142]
3 years ago
7

The multiplication property of equality could be used to solve which of the following equations?

Mathematics
2 answers:
USPshnik [31]3 years ago
4 0
Well
first one doesn't need that property
2nd one needs subtraction property of equality
third one can use it
fourth one needs addition property of equality


3rd one is answer
b/-2=18 is answer
Oduvanchick [21]3 years ago
3 0

b ÷ (-2) = 18
hope it helps

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What is the difference between a square root and dividing by 2?
Alex_Xolod [135]

Dividing by 2 is obvious. Square root is "a number which produces a specified quantity when multiplied by itself." Essentially the opposite of exponents.

4 0
3 years ago
Help please. I dont understand it..so I cant explain it
Ann [662]
A)
x^2 - 6x + c = - 5 + c

using a^2 - 2ab + b^2 = (a-b)^2
so
6x = 2 * x * 3
so
c = 9 

Answer
c = 9

b)
substitute c = 9
x^2 - 6x +  9 = - 5 + 9
(x - 3)^2 = 4

Answer:
(x - 3)^2 = 4

c) solve for x

(x - 3)^2 = 4
(x - 3)^2 = 2^2
so
x - 3 = 2  
     x = 5

and

x - 3 = -2
     x = 1

Answer: x = 1 , 3


8 0
3 years ago
The number of violent crimes committed in a day possesses a distribution with a mean of 4.2 crimes per day and a standard deviat
xxTIMURxx [149]

Answer:

a) is the correct answer

Step-by-step explanation:

Let X_i be the number of crimes on the i^{th} day. each X_i is a random varible with mean 4.2 and standard deviation 6, and all X_i are identically distributed and independent. Since the standard deviation is 6, then the variance is 36. Summing identiaclly distributed and independent random variables will make the mean and variance add up. Lets call S_{100} the sum of 100 of this random varaibles, then we have

M(S_{100}) = 100*4.2 = 420

V(S_{100}) = 100*36 = 3600

The sample mean of this 100 random variables is obtained by dividing S_{100} by 100. When we multiply/divide a random variable by a number \lambda , then its mean is multiplied/divided by \lambda and its variance is multiplied/divided by {\lambda}^2 . In this case, we are dividing by 100, so the mean will be 4.2 and the variance is divided by 100² = 10000, hence, its value will be 0.36. As a result, the standard deviation of the mean sample will be the square root of 0.36, which is 0.6.

We also know, as a consecuence of the Central Limit Theorem, that the mean sample of independant, identically distributed random variables, has distribution approximately normal if the sample is big enough (100 is more than enough) . So, we conclude that

  • The mean sample has approximately normal distribution
  • The mean sample has mean 4.2
  • The mean sample has standard deviation 0.6

The correct answer is option (a).

I hope that works for you!!

4 0
3 years ago
Which expression is equivalent to (2x² + 6x– 3) - (x^2– 2x – 7)?
enyata [817]

2nd one, x^2 + 8x + 4

add 2x^2-x^2, 6x+2x, -3+7

5 0
3 years ago
Read 2 more answers
In a 30 degree, 60 degree, 90 degree triangle if the hypotenuse is 14 cm then the long leg is 7v3cm
Blababa [14]
The sides of a 30, 60, 90 triangle is a, 2a, a\sqrt{3}
Since the give two sides are 7\sqrt{3} and 14, we can say the a=7. Hence the long leg is 7
4 0
3 years ago
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