What is a possible step when solving for x? select all that apply

An airline asked its agents to assign convenience ratings on a scale of 1-7 to 114 flights leaving one of its hub cities. The hi

Viefleur [7K]

17 bc it's in the middle (btw I didn't make that up my teacher in 6th grade said that)

8 0

3 years ago

Read 2 more answers

Carol sold 40 tickets to a school play for a total of $245. If each adult ticket sold for $8 and each child's ticket sold for $3

Delvig [45]

Answer:

Carol sold 15 child tickets and 25 adult tickets.

Step-by-step explanation:

Let's make a system, first let's set x to the number of child tickets sold and y to the number of adult tickets sold. We know that she sold 40 tickets in total to we have: x+y=40. Then, we know that adult tickets are sold for $8 and child tickets are sold for $3. So we have 3x+8y=245. We can solve this using substitution. If we subtract y from both sides of the first equation, we have x=-y+40. We can substitute this into the second equation:

3(-y+40)+8y=245

-3y+120+8y=245

5y+120=245

5y=125

y=25

Now we substitute this into any equation in the system to get the x value.

x+y=40

x+25=40

x=15

Carol sold 15 child tickets and 25 adult tickets.

8 0

3 years ago

a skating rink needs 200 prizes. a patent donates 9 small boxes of prizes and 2 large boxes of prizes. small box has 10 pens in

DIA [1.3K]

if there are 9 small boxes that contains 10 pens in each box that is a total of 90 pens. 2 large boxes which has 15 pens in each box that is a total of 30 pens. so all together you have 120 prizes. you need 200 so you subtract 120 from 200 which leaves you needing 80 prizes. your answer is 80 more prizes.

4 0

3 years ago

☺ un peloton de 441 Soldados forman un cuadrado

AlexFokin [52]

Answer:

http://trotamates.byethost3.com/index.php/segundo-ciclo-eso/75-ejercicios-sucesionesprogresiones?showall=1

Step-by-step explanation:

look if this helps

5 0

3 years ago

Use the sample data and confidence level given below to complete parts (a) through (d). A drug is used to help prevent blood c

Alla [95]

Answer:

a) $\hat p=\frac{148}{4167}=0.036$

b) $0.0355 - 1.96\sqrt{\frac{0.036(1-0.036)}{4167}}=0.030$

$0.0355 + 1.96\sqrt{\frac{0.036(1-0.036)}{4167}}=0.041$

Step-by-step explanation:

The sample proportion have the following distribution

$\hat p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

Part a

The estimated proportion for this case can be calculated like this:

$\hat p=\frac{148}{4167}=0.036$

Part b

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The confidence interval for the mean is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

Replacing we got:

$0.0355 - 1.96\sqrt{\frac{0.036(1-0.036)}{4167}}=0.030$

$0.0355 + 1.96\sqrt{\frac{0.036(1-0.036)}{4167}}=0.041$

8 0

4 years ago