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4 years ago

-9x - y = 28 9x + 4y = -4

Mathematics

1 answer:

Bad White [126]4 years ago

8 0

Answer:

(-4,8)

Step-by-step explanation:

solved with substitution method.

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Find the value of x.<br> A) 21 <br> B) 27 <br> C) 31 <br> D) 34

Ivahew [28]

The 2 angles given are vertical angles, which mean they are the same.

So we have: 3x +1 = 64

Subtract 1 from each side:

3x = 63

Divide both sides by 3:

X = 63 / 3

X = 21

The answer is A.

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3 years ago

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What is the probability of spinning an even number?

Debora [2.8K]

Answer:

3/5

Step-by-step explanation:

there are 6 even numbers and 4 odd so 10 in total which is 6/10 and that simplified is 3/5 PLS give me brainliest i beg

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4 years ago

Normal Distribution Problem. Porphyrin is a pigment in blood protoplasm and other body fluids that is significant in body energy

GarryVolchara [31]

Answer: a) 0.9332, b) 0.8944

Step-by-step explanation: the probability value attached to a z score is gotten by using a z distribution table.

The z score is gotten by making use of the formulae below

Z = x - u / σ

Where x = sample mean, u = population mean and σ = population standard deviation.

For our question, u = 38, σ = 12, we are to look for the z score at z ≤ 56, that's x = 56

By substituting the parameters, we have that

z ≤ 56 = 56 - 38/ 12

z ≤ 56 = 18/12

z ≤ 56 = 1.5

To get the probabilistic value, we check the normal distribution table.

The table I'm using will be giving me probabilistic value towards the left of the area.

From the table, p ( z ≤ 56) = 0.9332.

Z >23 = 23 - 38/ 12

Z >23 = - 15/ 12

Z >23 = - 1.25

The probability value of this z score is towards the right of the distribution but the table I'm using is only giving probability values towards the left.

Hence Z >23 = 1 - Z<23

From the table, Z<23 = 0.1056.

Z >23 = 1 - 0.1056

Z >23 = 0.8944

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3 years ago

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Evaluate 10 m + n 2 4 10m+ 4 n 2 10, m, plus, start fraction, n, squared, divided by, 4, end fraction when m = 5 m=5m, equals,

Bond [772]

Answer:

$\therefore10m+\frac{n^2}4 =54$

Step-by-step explanation:

Variables : The value of a quantity which can be changed.

Monomial : Monomial contains only one term.

Example 3x, 4,6y² etc.

Binomial: Binomial contains two terms.

Example 3+4y, 20+7z etc

Trinomial: Trinomial contains 3 terms.

Example 5x-2y+5, 7z-3y+4x etc.

Given that,

$10m+\frac{n^2}4$ [ It is a binomial.]

Putting m =5 and n=4

$= (10\times 5)+\frac{4^2}4$

$=50+\frac{4\times4}{4}$

$=50+4$

=54

$\therefore10m+\frac{n^2}4 =54$

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4 years ago

Suppose a simple random sample of size nequals49 is obtained from a population with mu equals 78 and sigma equals 28.

VLD [36.1K]

Answer:

0.0735,0.0179,0.7026

Step-by-step explanation:

Given that a simple random sample of size nequals 49 is obtained from a population with mu equals 78 and sigma equals 28.

Sample size = 49

Population mean = 78

Population std deviation = 28

Std error of sample mean = $\frac{\sigma}{\sqrt{n} } \\=4$

a) $\bar x$ : N(78, 4)

b) $P(\bar x >83.8)\\=0.0735$

(by converting to Z and finding value from Z table)

c) P (x overbar less than or equals 69.6 )

= $P(\bar x \leq 69.6)\\=0.0179$

d) P (75.8 less than x overbar less than 88 )

= $P(75.8$

4 0

4 years ago