3x + 5y = -19 5x - 2y = 16 solve for x and y

A family worked all day building a sandcastle on the beach. As they were building the castle they recorded the number of pails o

LiRa [457]

Answer:

15708 cubic inches

Step-by-step explanation:

The formula for a cylandir is V=πr^2h, substitute in your known factors and multiply by 20 for the 20 pails used and you get your answer.

5 0

1 year ago

Vanita began her trip to Washington, D.C. on a full tank of gas. Her odometer read 54,250. When she arrived in Washington, her o

mafiozo [28]

The solution to the problem is as follows:

To Washington DC, she travelled a total of 54538 - 54250 = 288 miles.

Therefore, 288 miles / 9 gal = 32 miles/gal.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

6 0

2 years ago

Kate is constructing an equilateral triangle. She has already used her straightedge to construct the line segment shown. A line

gavmur [86]

Given that Kate is constructing an equilateral triangle and she has already used her straightedge to construct a line segment AB.

What Kate should do for her next step is "Place the point of the compass on point A and draw an arc, using AB as the width for the opening of the compass".

4 0

2 years ago

A poll conducted in 2013 found that 55% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard

alina1380 [7]

Answer:

The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.

Step-by-step explanation:

Confidence interval:

A confidence interval has the following format:

$M \pm zs$

In which M is the sample mean, z is related to the confidence level and s is the standard error.

55% of U.S. adult Twitter users get at least some news on Twitter (Pew, 2013). The standard error for this estimate was 2.2%.

This means that $M = 55, s = 2.2$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

Lower bound of the interval:

$M - zs = 55 - 2.575*2.2 = 49.34$

Upper bound:

$M + zs = 55 + 2.575*2.2 = 60.66$

The 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter is between 49.34% and 60.66%, which means that we are 99% sure that the true percentage of US adult Twitter users who get some news is in this interval.

6 0

2 years ago

1. Which description best describes the solution to the following system of equations?

Alisiya [41]

1. The best answer is A since a solution is where 2 lines intersect. Whether or not they intersect the x or y axis is completely irrelevant (so is whether they intersect the origin).

2. y=-x+5
-x+5=1/2x+2
-x+3=1/2x
3=3/2x
2=x

y=-(2)+5
y=3

Answer: (2,3)

3. It seems like the lines are completely on top of each other (coinciding) so there are infinitely many solutions.

6 0

2 years ago

Read 2 more answers