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3 years ago

Please help me to solve the problems

Mathematics

2 answers:

timurjin [86]3 years ago

6 0

The number of movies are:
$4 \times 10 + 2 = 40 + 2 = 42$
the first missing number is 4 then 2 then 42

olchik [2.2K]3 years ago

3 0

I can’t help you I’m sorry

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Which expressions are polynomials? Select each correct answer.

lilavasa [31]

Here's an example

Simplify by collecting like terms: 4(x2y + 7y) – 5y(3x2 – y) – 10y

A) −11x2y + 5y2 + 18y

B) 4x2y + 11y – 8yx2 – 16y

C) 4x2y + 18y – 15yx2 + 5y2

D) 4x2y – 5y(3x2 – y) – 3y

A) −11x2y + 5y2 + 18y

Correct. 4(x2y + 7y) – 5y(3x2 – y) – 10y = 4x2y + 28y – 15yx2 + 5y2 – 10y = 4x2y + 18y – 15yx2 + 5y2 = −11x2y + 5y2 + 18y.

B) 4x2y + 11y – 8yx2 – 16y

Incorrect. The 4 is distributed to both terms in the parentheses by multiplying each term by 4 resulting in 28y, not 11y. The −5y is similarly distributed to each term in the parentheses, resulting in −15yx2 + 5y2. The correct answer is −11x2y + 5y2 + 18y.

C) 4x2y + 18y – 15yx2 + 5y2

Incorrect. This polynomial can be further simplified by combining the like terms 4x2y and −15yx2. The order of the variables in a term does not matter. The correct answer is

−11x2y + 5y2 + 18y.

D) 4x2y – 5y(3x2 – y) – 3y

Incorrect. Before combining like terms, you must distribute to clear the parentheses. The correct answer is −11x2y + 5y2 + 18y.

8 0

3 years ago

There are 8 students who have 3/4 if a cake they want to share. How much of the cake will each student get if they split it even

bekas [8.4K]

3/32 because 3/4÷8/1=
3×1=3
4×8=32
3/32

8 0

3 years ago

On day 1 of a savings challenge $7 was deposited. On day 8 $56 is deposited. What could be an ordered pair for this scenario?

miv72 [106K]

An ordered pair for this scenario would be 7

8 0

3 years ago

Does 4/6 have equal parts

Svet_ta [14]

Answer:

yes

Step-by-step explanation:

4/6 of 100 = 66.6666666667

6 0

2 years ago

People tend to evaluate the quality of their lives relative to others around them (Frieswijk et al., 2004). In one study, resear

Alborosie

Answer:

Step-by-step explanation:

Hello!

Research.

n=9 frail elderly were interview and compared to a fictitious person who was worse off then the interviewee, a life-satisfaction score was determined for each person.

18, 23, 24, 22, 19, 27, 23, 26, 25

Assuming that the population average score is μ= 20, the researchers think that the elderly in the sample are more or less satisfied than others in the general population.

a. You have the information of one sample, assuming this sample has a normal distribution and each elderly interviewed is independent, then the t-test of choice is a one-sample t-test.

b. and c. If you say that the elderly are "more or less" satisfied than the others, this means that they are either as satisfied as to the general population or not satisfied as to the general population. Symbolically:

H₀: μ = 20

H₁: μ ≠ 20

This is a two-tailed test, meaning, you will have two critical regions.

α: 0.05

Left critical value: $t_{n-1;/\alpha 2} = t_{8; 0.025}= -2.306$

Right critical value: $t_{n-1;1-\alpha /2} = t_{8;0.975} = 2.306$

$t_{H_0}= \frac{X[bar]-Mu}{\frac{S}{\sqrt{n} } } ~t_{n-1}$

X[bar]= 23

S= 3

$t_{H_0}= \frac{23-20}{\frac{3}{\sqrt{9} } }= 3$

Considering that the calculated t-value is greater than the right critical value, the decision is to reject the null hypothesis, so using a significance level of 5% you can conclude that the average life-satisfaction score of the elderly is different than 20.

I hope it helps!

7 0

3 years ago