5 <br> 2<br> +(12−7+x) if x=6

Express -3/6 as a rational number with denominator 20

Usimov [2.4K]

Answer:

20 cause when According to Sciencealert, the longest math equation contains around 200 terabytes of text. Called the Boolean Pythagorean Triples problem, it was first proposed by California-based mathematician Ronald Graham, back in the 1980s.The Navier-Stokes equation, for me is the hardest of all. This is the full Navier-Stokes equation in conservative form. It looks pretty simple, but as one will dig in, they will notice why it is the hardest one.

4 0

4 years ago

A rare baseball card just sold for $12,000. Sports experts anticipate this baseball card to increase in value by 9% each decade.

Elodia [21]

Answer:

15,240.

Step-by-step explanation:

9 percent of 12,000 is 1080. so, we have to add 1080 plus 1080 plus 1080. Which is 3,240. 12,000 plus 3,240 is 15,240. Let me know if this helps!

4 0

3 years ago

WILL MARK BRAINLIEST!

IceJOKER [234]

The correct answer would be (0,2) since in standard form the y-int is C/B

C=-4 & B=-2

C/B = -4/-2 4/2 = 2/1 = 2

y-intercept = 2

7 0

3 years ago

Read 2 more answers

there are 16 boys and 24 girls in chorus whats the percent of the total number of students in chorus are boys?

Ipatiy [6.2K]

The percent of boys in the class is 40% because 16 + 24 = 40 (the entire amount of kids) 16 / 40 = .4 then move decimal twice to the right for percentage which gives you 40%

The answer is 40%

I hope this helped :)

5 0

3 years ago

Read 2 more answers

Bank of America's Consumer Spending Survey collected data on annual credit card charges in seven different categories of expendi

cupoosta [38]

Answer:

a) Null hypothesis: $\mu_d= 0$

Alternative hypothesis: $\mu_d \neq 0$

b) $t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{850 -0}{\frac{1123}{\sqrt{42}}}=4.905$

The next step is calculate the degrees of freedom given by:

$df=n-1=42-1=41$

Now we can calculate the p value, since we have a left tailed test the p value is given by:

$p_v =2*P(t_{(41)}>4.905) =0.000015$

So the p value is lower than any significance level given, so then we can conclude that we can reject the null hypothesis that the difference between he two groups are equal.

Step-by-step explanation:

Assuming the following questions:

We assume the following data: $n = 42 ,\bar d= 850 , s_d = 1123$

Previous concepts

A paired t-test is used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample. For example if we have Before-and-after observations (This problem) we can use it.

a. Formulate the null and alternative hypotheses to test for no difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out.

The system of hypothesis for this case are:

Null hypothesis: $\mu_2- \mu_1 = 0$

Alternative hypothesis: $\mu_2 -\mu_1 \neq 0$

Or equivalently

Null hypothesis: $\mu_d= 0$

Alternative hypothesis: $\mu_d \neq 0$

b. Use a .05 level of significance. Can you conclude that the population means differ? What is the p-value?

$t=\frac{\bar d -0}{\frac{s_d}{\sqrt{n}}}=\frac{850 -0}{\frac{1123}{\sqrt{42}}}=4.905$

The next step is calculate the degrees of freedom given by:

$df=n-1=42-1=41$

Now we can calculate the p value, since we have a left tailed test the p value is given by:

$p_v =2*P(t_{(41)}>4.905) =0.000015$

So the p value is lower than any significance level given, so then we can conclude that we can reject the null hypothesis that the difference between he two groups are equal.

4 0

3 years ago

5 2 +(12−7+x) if x=6