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2 years ago

Please please help help me with two questions!!

Mathematics

1 answer:

kykrilka [37]2 years ago

6 0

Answer:

A. True

B. False

Step-by-step explanation:

1: 30 + 10 = 40 and 8 x 5 = 40 (both match)

2: 75 - 25 = 50 and 5 x 9 = 49 (Doesn't match)

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Tell whether the equation has one, zero, or infinitely many solutions.2(x − 3) + 4 = 1x − 5.

tankabanditka [31]

Answer:one solution

Step-by-step explanation:

x=-3, TeR

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2 years ago

Liam is setting up folding chairs for a meeting. If he arranges the chairs in 8 rows of the same length, he has 9 chairs left ov

Mnenie [13.5K]

8x +9 = 6x + 21 where x = number of chairs in each row
2x=12
x=6

sub back into original equation 8 x 6 + 9 =57 chairs

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2 years ago

Combine like terms<br><br> 4y^2+4(7y^2-8)=<br><br> please show your work

kirza4 [7]

Answer:

32y^2-32

Step-by-step explanation:

4y^2+4(7y^2-8)

4y^2+28y^2-32

32y^2-32

if you need extra steeps explaining then plz let me know and I will help :)

8 0

2 years ago

The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of 0.917 g and a standard deviation

Nutka1998 [239]

Answer:

$z = \frac{0.872-0.917}{\frac{0.303}{\sqrt{37}}}= -0.903$

And we can find this probability to find the answer:

$P(z$

And using the normal standar table or excel we got:

$P(z$

Step-by-step explanation:

Let X the random variable that represent the amounts of nocatine of a population, and for this case we know the distribution for X is given by:

$X \sim N(0.917,0.303)$

Where $\mu=0.917$ and $\sigma=0.303$

We have the following info from a sample of n =37:

$\bar X= 0.872$ the sample mean

And we want to find the following probability:

$P(\bar X \leq 0.872)$

And we can use the z score formula given by;

$z=\frac{x-\mu}{\frac{\sigma}{\sqrt{n}}}$

And if we find the z score for the value of 0.872 we got:

$z = \frac{0.872-0.917}{\frac{0.303}{\sqrt{37}}}= -0.903$

And we can find this probability to find the answer:

$P(z$

And using the normal standar table or excel we got:

$P(z$

6 0

3 years ago

Need some help with 2 (Geo)

MrRissso [65]

ans：A （60）
as it is opposite to 60degree and the theory of this is same with opposite number

8 0

2 years ago