Mathematics High School

Solve for k.
k² - 19k - 20 =0

Answers

Answer 1

Answer:

k = -1, 20

Step-by-step explanation:

k² - 19k - 20 = 0

k² + 1k - 20k - 20 = 0  ==> 1 * (-20) = -20   and   -20 + 1 = -19

k² + k - 20k - 20 = 0  

k(k+1) - 20(k+1) = 0   ==> factor and simplify

(k-20)(k+1) = 0

k-20=0  ==> k=20

k+1=0  ==> k=-1

k = -1, 20

Answer 2

Answer:

k² - 19k - 20

(k-20) (k+1) = 0

k-20 = 0

k=20

k+1 = 0

k= -1

k= 20 and -1

Solve For K.k - 19k - 20 =0

Related Questions


Write and solve the equation for t to find when
there is 200 gallons of water in the tub.

Answers

Answer:

t = 10 minutes

Step-by-step explanation:

200 = 600 - 40t

-400 = -40t

t = 10

Each table represents a proportional relationship.

I NEED HELPPP

Answers

Answer is:

m: 30
n: 6, 3/5

NEED HELP QUICK!!!!! A set of data includes the point (17,3.8) and has the regression equation y=-25x+436. What is the residual for this point

Answers

Given:

The regression equation is:

[tex]y=-25x+436[/tex]

The given point is (17,3.8).

To find:

The residual for the given point.

Solution:

We have,

[tex]y=-25x+436[/tex]

Substituting [tex]x=17[/tex], we get

[tex]y=-25(17)+436[/tex]

[tex]y=-425+436[/tex]

[tex]y=11[/tex]

The predicted value at [tex]x=17[/tex] is 11.

The given point is (17,3.8). It means the observed value at [tex]x=17[/tex] is 3.8.

Formula for residual:

Residual = Observed value - Predicted value

Residual = [tex]3.8-11[/tex]

Residual = [tex]-7.2[/tex]

Therefore, the residual for the given point is -7.2.

PLEASE HELP WHAT ONE
Its not C

Answers

Answer:

D. (-3, 4)

Step-by-step explanation:

Tom earns ​$16 a week mowing lawns. He spends 1 4 of his earnings on lunch and 1 2 of his earnings on music. He saves the rest. How many dollars does Tom​ save? Tell how you found the answer

Answers

Tom is in debt, By -26 dollars.

Answer:

32 dollars

Step-by-step explanation:

I think the answer is $32 because 14-12 is 2 and if you multiply 16 times 2 that's how I got the answer. I could be wrong I am sorry if I am.

A rate written as 80 miles per hour is an example of a

Answers

i have no clue so sorry

The table shows some ordered pairs that belong to a quadratic function.

Answers

Answer:

A. Y ≤ 4.

Step-by-step explanation:

This  opens downwards and has a maximum  at f(x) = 4.

1. Value-Mart is advertising a Back-to-School sale on pencils. A pack of 24 sells
for $4.99, whereas a pack of 12 sells for $3.23. Which is the better buy? How do
you know?

Answers

Answer:

24 because you get more pencils to use in case one breaks.

The pack of 24 is a better value because each pencil is costing you $0.207 while the pack of 12 has each pencil costing $0.269

Find the area of the shape.

Answers

Answer:

27π

Step-by-step explanation:

A = πr²

  = π(6)²

   =36π

You want 3/4 of the circle

(3/4) 36π = 27π

can someone help me please ?

Answers

Answer:

-5/-3

Step-by-step explanation:

first y intercept=

-5/-3

I dont know how to do any of this help me pls

Answers

Get 180, then subtract every angle you see in the diagram and you'll get your answer.

Can someone help me with this equation?

Answers

Answer:

so far i think 9 but that's all I know for how

Step-by-step explanation:

image them turning into triangles

e) What does the value of the mean absolute deviation tell you about the spread of the data? (2 points)

Answers

Answer:

The mean absolute deviation of a dataset is the average distance between each data point and the mean. It gives us an idea about the variability in a dataset. ... Step 2: Calculate how far away each data point is from the mean using positive distances.

Mean deviation is defined as how much is each element of the data is far away from the mean of the data.

What is mean in statistics?

We can define the mean of the given data set as the average of all the numbers. Mathematically, we can write mean as -

M = ∑x{i}/n

Given is to discuss what does the value of mean absolute deviation tell about the spread of the data.

Mean deviation is defined as how much is each element of the data is far away from the mean of the data. Mathematically, we can write mean deviation as -

[tex]$\frac {1}{n} \sum \limits_{i=1}^n |x_i-m(X)|[/tex]

where -

m(X) = average or mean value(n) = number of data elements in the data setx(i) = data values

Therefore, Mean deviation is defined as how much is each element of the data is far away from the mean of the data.

To solve more questions on Mean deviation, visit the link below-

https://brainly.com/question/10528201

#SPJ2

An company charges an initial fee of $350, plus $50 for each additional service added.

Which function can be used to find y, the total amount a customer would pay after n services were added.

Answers

Answer:

Y=250+50n

Step-by-step explanation:

Well since y in this case is total cost that is basically (f) the function range.

The domain in this case is the 250 one time fee and the 50 buks per services.

need help today!!!! plzs

Answers

Answer:

x=29

Step-by-step explanation:

cuz it's a 90 degree angle so 90-32 is 58 and divide it by 2 is 29 which would be x=29

Solve the equation.
- 9/4v + 4/5 =7/8

Answers

Answer:

-1/30

Step-by-step explanation:

HURRY PLEASE
A teacher surveyed her class after they had taken a vocabulary test. Elghteen of the students claimed they had studled
at least one hour for the test. The remaining twelve students admitted that they had not studied for the test at all. The
test results (expressed as a percent) for the two groups are shown below.
Studied: 87, 100, 94, 79, 92, 100, 95, 83, 89, 99, 100, 91, 89, 95, 100, 93, 96, 83
Did Not Study. 82, 72, 45, 91, 58, 83, 65, 87, 90, 77, 73, 89
Part 1: Calculate the mean of the group that did not study, rounded to the nearest tenth.
Part 2: Calculate the mean absolute deviation of the group that did not study, rounded to the nearest tenth.
Part 3: How many of the scores (from the group that did not study) are more than two mean absolute deviations from the
mean?

Answers

Answer:

Crown the other person brainliest

Step-by-step explanation:

:)

3000(.65), where t is
1. The amount of hair Jafar has left can be modeled by the equation f(t)
time in days. Which statement describes the change in number of hairs per day?
a. 65% decrease daily
b. 65% increase daily
c. 35% increase daily
d. 35% decrease daily

Answers

the answer is c. 35% increase daily

Is -5 equal to 5? I need help

Answers

Answer:

yes

Step-by-step explanation:

Yes It is I think! There’s no difference so it should be yes! It’s the same thing! If you do get this wrong I am very sorry! I just think it is!

21) Which expression is equivalent to 6(7x − 4)? A) 13x − 10 B) 13x − 24 C) 42x − 10 D) 42x − 24

Answers

Answer:

Answer is D) 42x − 24

Step-by-step explanation:

Opening the expression given in question

6(7x − 4)

6 will be multiplied by both items present inside parenthesis.

it can be written as

={(6 * 7x) - (6*4)}

=42x-24

Hope that clears the question.


Find the slope of each line.

Answers

Answer:

C) 1

Step-by-step explanation:

Slope = change in y over change in x

In the graph shown as y goes up 1 x goes up 1

so slope = 1/1 or 1

The slope equation is y=mx+b.

b is where the line crosses on the y axis, also known as the y-intercept.

m is the slope, which you are trying to find.

y and x are the points on the graph.

The slope is 3/3, which can be turned into 1, so the answer is c.

can someone please help me on this problem.

Answers

Your answer should be 101°. 52+53+154= 259. 360-259= 101. Hope that helps

please dont put any links​

Answers

Answer: It increased by 72%

Almost 9 over 11 of the total electricity supplied to a town is used in farms and houses. Determine the decimal equivalent of 9 over 11. I know the answer is 81 I just need to know why it is a repeating decimal?

Answers

Answer:

Cuz the number after the decimal repeats

Step-by-step explanation:

Write an equation of the parabola with focus (0, -3) and vertex at the origin. Use z for the independent variable.

Answers

Answer:

z^2 = -12y

or y = -(z^2/12)

Step-by-step explanation:

Answer:

z^2 = -12y

Step-by-step explanation:

Given the vertex at origin;

This is same as (0,0)

The focus (0,-3)

The general form is;

(z-h)^2 = 4p(y-k)

(h,k) is the vertex (0,0); so h = 0 and k = 0

The focus is given as;

(h,k + p)

so ;

k + p = -3

but k =0

so p = -3

Thus, the equation of the parabola is;

(z-0)^2 = 4(-3)(y-0)

z^2 = -12y

Please help if you would like brianleist!!!

Answers

the answer is 70 the third option.

What is the commission rate for a car salesman who earned $1500 in commission on a 25,000 car?

Answers

Answer:

6%.

Step-by-step explanation:

Find the value for a.

Answers

Answer:

a = 25

Step-by-step explanation:

The exterior angles of a polygon sum to 360°

Sum the exterior angles and equate to 360

a + a + 40 + 51 + 55 + 54 + 2a + 60 = 360, that is

4a + 260 = 360 ( subtract 260 from both sides )

4a = 100 ( divide both sides by 4 )

a = 25

Which has a greater slope, a horizontal line or a vertical line?

A. A vertical line has no defined slope, so the comparison cannot be made.
B. Horizontal line
C. Vertical line
D. A horizontal line has no defined slope, so the comparison cannot be made.

Answers

Answer:

A

Step-by-step explanation:

The slope of a vertical line is undefined

The slope of a horizontal line is 0

Hellllppp “Jason states that ^ABC = ^RST. Kelley states that ^ABC = ^TSR. Which best describes the accuracy of the congruency statements?

Answers

Answer:

the answer is C

Step-by-step explanation:

i just took the test

Answer:

C. Both statements could be correct. RST could be the result of two translations of ABC. TSR could be the result of a reflection and a translation of ABC.

Step-by-step explanation:

Right on ED2021

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