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3 years ago

Which phrase represents the algebraic expression 5x-9

2 answers:

6 0

the product of five times a number and nine the difference of nine times a number and five the sum of five times a number and five the difference of five times a number and nine

raketka [301]3 years ago

5 0

Answer:

Five times a number" is written as 5x. This is because the number itself is unknown, so we use a variable.

"Difference" means subtraction; thus "The difference of five times a number and 9" would be 5x-9.

Step-by-step explanation:

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Which expression is equivalent to (3x-5y)+(x+2y) A.4x-7y B.4x-3y C.4x+3y D.4x7y

Andreas93 [3]

Answer:

B.4x-3y

Step-by-step explanation:

(3x-5y)+(x+2y)

Combine like terms

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3 years ago

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3 years ago

Consider a binomial distribution of 200 trials with expected value 80 and standard deviation of about 6.9. Use the criterion tha

mote1985 [20]

Answer:

The correct answer is option 'a' : 120 is more than 2.5 standard deviations above the expected value.

Step-by-step explanation:

For an exponential distribution we have

The expected value μ = 80

No of trails n = 200

Thus we have

$p=\frac{80}{200}=0.4$

The deviation is related to expected value and probability as

$\sigma =\sqrt{np(1-p)}\\\\\therefore \sigma =\sqrt{200\cdot 0.4\cdot (1-0.4)}=6.9$

Thus the values between the given deviation is

$x_{1}=80-2.5\times 6.9=62.75\\\\x_{2}=80+6.9\times 2.5=97.25$

Now since 120 successes are out of the range of [62.75,97.25] thus 120 is more than the expected value.

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3 years ago

In triangle ABC, angle A is 25 degree, and Angle B is 105 degrees. what is the measure of angle c

Scilla [17]

Angle c= 60°

This is because 105+25+x=180°
Hope this helps and good luck!! :)

8 0

3 years ago

The point (2, -1) is on the line 2x + y = 5.

malfutka [58]

Answer:

Step-by-step explanation:

Substitute by x = 2 and y = - 1

You will get 2*2 + (-1) = 3 not 5

Then it doesn't lie

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3 years ago