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3 years ago

How??? I really need to know this but I can't make sense of it

Mathematics

1 answer:

Tomtit [17]3 years ago

3 0

Let's start with number 2. To do this you have to transfer it into an equation. Know that in this type of situation, you can turn the word "is" into an equals sign. Next, break it up. 7 times the sum of a number and six. That is the first part. First, find an expression for both. 7 is just 7. And now, a number and 6. You can always substitute "a number" with x. So a number and 6 would be x+6. 7 times the sum of a number and 6 would be... 7*(x+6). Now lets get to the other side of the equation. This is easy. "negative 43" would be -43. So the final equation would be. 7(x+6)=-43

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You are curious about the average number of yards Matthew Stafford throws for each game for the Detroit Lions. You randomly sele

Damm [24]

Answer:

The margin of error for this estimate is of 14.79 yards per game.

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

T interval

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 20 - 1 = 19

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 19 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.95}{2} = 0.975$ . So we have T = 2.093

The margin of error is:

$M = T\frac{s}{\sqrt{n}}$

In which s is the standard deviation of the sample and n is the size of the sample.

You randomly select 20 games and see that the average yards per game is 273.7 with a standard deviation of 31.64 yards.

This means that $n = 20, s = 31.61$

What is the margin of error for this estimate?

$M = T\frac{s}{\sqrt{n}}$

$M = 2.093\frac{31.61}{\sqrt{20}}$

$M = 14.79$

The margin of error for this estimate is of 14.79 yards per game.

3 0

3 years ago

Solve this quetion...4

alukav5142 [94]

Answer:

1350 grains

Step-by-step explanation:

Since he needs 450 grains for 6 people, he would need three times that for three times the amount of people.

Therefore, for $6\cdot3=18$ people, he would need $450\cdot3=1350$ grains.

8 0

3 years ago

Students were asked how many books they were carrying in their backpacks. The data is shown in the frequency table. What is the

maxonik [38]

Answer:

Some students were asked how many books they were carrying in their backpacks. The data is given in this frequency table. What is the mean number of pens carried by these students in their backpacks?

Pens Frequency

0 4

1 5

2 8

3 4

4 3

5 1

A.2

B.3.5

C.4

D.5.5

3 0

3 years ago

If the APY of a savings account is 2.4% and if the principal in the savings account is $2200 for an entire year, what will be th

Aleks [24]

To solve this problem, we must recall that the formula for money with compound interest is calculated as:

Total = Principal × ( 1 + Rate ) ^ n

Total = $2,200 × ( 1 + 0.024 ) ^ 1

Total = $2,252.80

<span>Therefore the answer is letter B.</span>

8 0

4 years ago

Read 2 more answers

Clara has a package of six cookies she wants to share equally among her friends if Claire make sure that each piece of cookie wi

Nikolay [14]

Answer:

Clara can feed 10 friend

I may be wrong, but I tried :P

8 0

3 years ago