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3 years ago

Which one is correct? Please answer fast

Mathematics

2 answers:

olya-2409 [2.1K]3 years ago

6 0

Answer:

The first one

Step-by-step explanation:

2x means you need to multiply x by 2, not add

MAXImum [283]3 years ago

3 0

Answer:

first one

Step-by-step explanation:

You might be interested in

Working alone and at a constant rate, Machine A takes 3 hours to create a widget. Machine B, working alone and at a constant rat

PilotLPTM [1.2K]

Answer:

Time required by Machine B to create a widget = 4 hours

Step-by-step explanation:

Time taken by Machine A ( $T_{A}$ ) = 3 hours

Time taken by Machine B ( $T_{B}$ )= x hours

Time taken by both machines by working together = 12 hours

The time required to both machines by working together to finish a task is given by the formula = $\frac{T_{A} {T_{B} } }{T_{A} + T_{B} }$

Put the values in above formula we get

⇒ T = $\frac{3 x}{3 + x}$

⇒ 12 = $\frac{3 x}{3 + x}$

⇒ 36 + 12 x = 3 x

⇒ x = - 4 hours

This is the time required by Machine B to create a widget.

8 0

3 years ago

Ally has a bag of candy. After dividing the candy equally among six people and eating 4 pieces of candy she had 7 pieces left. H

uranmaximum [27]

Answer:

66 pieces of candy.

Step-by-step explanation:

First I set up the equation: (c/6)-4 = 7

c represents the candy she started with.

6 represent when she split the candy

4 is the number of pieces she has eaten

7 is the number of pieces she has left

after setting up the equation, you want to add four to the other side to get 11

c/6 = 7+4 --> c/6 = 11

Then you want to multiply by 6 to get ride of the fraction to get a total of 66 pieces of candy.

c = 11 x 6 --> c = 66

4 0

3 years ago

Read 2 more answers

Please help brainliest, thanks, five star

vichka [17]

Answer:

the first and last options

Step-by-step explanation:

option 1 is simply -21x/4 -21

last option is clearly equivalent to the question

3 0

3 years ago

How does 0.03 compare to 0.003

kati45 [8]

0.03 compare to 0.003

While comparing decimals we write the decimals one below the other according to the place value of each digits in place value chart

ones -- point -- Tenths -- Hundredths -- Thousandths

0 . 0 3

0 . 0 0 3

Now we compare each digit left to right. We have 3 in hundredths and 0 in hundredths place. 3 is greater

So 0.03 is greater than 0.003

0.03 > 0.003

6 0

4 years ago

Read 2 more answers

A student working on a summer internship in the economic research department of a large corporation studied the relation between

OverLord2011 [107]

Answer:

Step-by-step explanation:

Hello!

Y: sales of a product in a marketing district (million dollars)

X: population in a marketing district (million persons)

The objective is to test if there is a linear association between the sales of a product and the population of a marketing district.

Parameter; Estimated Value; 95 Percent Confidence limits

Intercept 7.43119 -1.18518 16.0476

Slope 0.755048 0.452886 1.05721

To test if there is or not an association between these two variables, you have to do a hypothesis test for the slope. If the slope is equal to zero, there is no linear association between the two variables, if the slope is different from zero, then there is a linear association between the variables.

So the student's hypotheses are:

H₀: β = 0

H₁: β ≠ 0

The data the student used to conclude is the 95%CI for the slope [0.452886;1.05721]

To be able to decide over an hypothesis test using a confidence interval there are several conditions to be met, one of them is that the confidence level and the significance level should be complementary, this means that if the interval was constructed using 1 - α= 0.95, then the hypothesis test should be conducted with a significance level of α= 0.05.

Considering that the value of the slope stated in the null hypothesis is not included in the given interval, i.e. zero is not included in the CI, then the decision is to reject the null hypothesis.

Then it can be concluded that there is a linear association between the sales of a product and the population in a marketing district.

Although in the context of the variables of study it makes no sense that the estimate of the intercept takes negative numbers, keep in mind that mathematically if possible and correct. This means that obtaining a negative estimate of the intercept does not represent a calculation error or problem for the regression model. In general, when this occurs, a footnote is made indicating has no biological meaning or sense in context.

After all, what you have done with the estimate is a mathematical assertion of the social variables.

I hope it helps!

3 0

3 years ago