1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
polet [3.4K]
4 years ago
8

What is point A (-9, -18) rotated 90° counterclockwise?

Mathematics
1 answer:
DedPeter [7]4 years ago
7 0

Answer:

(18, - 9 )

Step-by-step explanation:

Under a counterclockwise rotation about the origin of 90°

a point (x, y ) → (- y, x ), thus

A(- 9, - 18 ) → (18, - 9 )

You might be interested in
A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 380 babies were​ born, a
Alex Ar [27]

Answer:

The 99​% confidence interval estimate of the percentage of girls born is (86.04%, 93.96%). Considering the actual percentage of girls born is close to 50%, the percentage increased considerably with this method, which means that it appears effective.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

In the study 380 babies were​ born, and 342 of them were girls.

This means that n = 380, \pi = \frac{342}{380} = 0.9

99% confidence level

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

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 - 2.575\sqrt{\frac{0.9*0.1}{380}} = 0.8604

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 + 2.575\sqrt{\frac{0.9*0.1}{380}} = 0.9396

As percentages:

0.8604*100% = 86.04%.

0.9396*100% = 93.96%.

The 99​% confidence interval estimate of the percentage of girls born is (86.04%, 93.96%). Considering the actual percentage of girls born is close to 50%, the percentage increased considerably with this method, which means that it appears effective.

4 0
3 years ago
Rob had twenty-two dollars and two pennies to spend on six raffle tickets. How much did
Brilliant_brown [7]

Answer:

$3.07

Step-by-step explanation:

22.2/6=3.7

hope this helps!

4 0
3 years ago
Read 2 more answers
PLEASE HELP
timofeeve [1]

Answer:

3 not sure if you saw it Amazing the following statements best describes the role of yourself and God bless you and take care for you guys to paperwork

8 0
3 years ago
I need to find the answer to these questions in about 10 minutes or I'm screwed. please help me out.
Savatey [412]
For the first figure, the geometric figure used in the construction that is shown is the intersection of the angle bisectors of the triangle is the center of the inscribed circle.

For the second figure, the construction of the above figure in the circle represents how to find the intersection of the perpendicular bisectors of triangle ABC.

For the third figure, the statement that is demonstrated in the in line P intersecting line m perpendicularly is the set of points equidistant from the endpoints of  a line segment  is the perpendicular bisector of the segment.
7 0
4 years ago
Find the square of -x^2 +4x-8=0
kolbaska11 [484]
The answer to the question is
5 0
3 years ago
Other questions:
  • 2 is divided by the difference of a number and 3
    15·1 answer
  • The base of the right triangle drawn in the regular octagon measures 0.7 cm.
    14·2 answers
  • Is number 1 and 2 correct and can someone help me with number 3
    6·1 answer
  • Can someone plzzz help me with number 7 and the bottom ones plzzz and show work for number 7 plzzzz
    10·1 answer
  • Solve for y.<br> K= 32yz <br> pls
    5·1 answer
  • PLEASE HELP ME WITH NUMBER 41. find the value of x Pleaseeee
    10·1 answer
  • Is the quotient of -125 and five positive negative or zero
    13·2 answers
  • I will mark you brainless
    10·1 answer
  • Mr. Clinton went to the lumber company. He bought 6 boards at a cost of $4.12 per board and 5 pounds of nails at $0.78 per pound
    10·2 answers
  • Compare: These two equations
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!