Answer:
k = 2
Step-by-step explanation:
3(-1) + k(5) = 7
-3 + 5k = 7
5k = 10
k = 2
The value of K in the equation 3x + Ky =7 is 2.
What is an equation?Two algebraic expressions having same value and symbol '=' in between are called as an equation.
Given:
Equation 3x + Ky =7.
And we have also given that (-1, 5) satisfies the equation.
That means,
(-1, 5) is a solution of the equation.
To find the value of K;
Substitute the value of x = -1 and y = 5
So,
3x + Ky =7,
3(-1) + K(5) =7
-3 + 5K = 7
5K = 10
K = 2
Therefore, the value of K is 2.
To learn more about the equation;
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In a survey of favorite pets, 45 students said they preferred cats. This was 30% of the total number of students surveyed. How many students took the survey?
Answer:
150 students
Step-by-step explanation:
45/30= 1.5 which equals 1%.
multily 1.5 x 100 = 150 students
What are some things that might be necessary to know in order to solve problems involving quadratic regression?
Answer:
When given a set of data, we can use our graphing calculator to generate the quadratic regression equation. This is the equation that best fits a set of data, using a quadratic model.
Step-by-step explanation:
got a 100%
The things which are necessary to know in order to solve problems involving quadratic regression are data, correlation coefficient and quadratic equation.
What is quadratic regression?The quadratic regression is the statistical process which is used to obtain the equation of parabola, to represent the data set in the most appropriate way.
The things which are necessary to know in order to solve problems involving quadratic regression are listed below.
The most important thing for approaching quadratic regression problem is visualize the data.Make a proper table with x and y values with the data. These values should form a parabola for the quadratic regression.Find the correlation coefficient. The closer the value of correlation coefficient to 1, the data good fit into the quadratic equation.Least square method is the best way to solve the problems involving quadratic regression.Thus, the things which are necessary to know in order to solve problems involving quadratic regression are data, correlation coefficient and quadratic equation.
Learn more about the quadratic regression here;
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hi please help......
Answer:
9/20
Step-by-step explanation:
45%=45/100
hope this helps
Determine if each ordered pair is a part of the solution set of the linear inequality. Select Yes or No.
Ordered Pair
Yes
No
(0,-5)
O
(7, – 4)
O
(-6, -7)
o
(-4,1)
O
(4,8)
O
Answer:
yes
Step-by-step explanation:
i will love you if u please answer this question PLSS
Answer:
On the dive boat deck
Step-by-step explanation:
This is above the water level and water level is considered to be 0
pls love me <3
PLEASE HELP ILL MARK BRAINLIEST!!! Find the area & circumference of the circle. Use pi=3.14
Answer:
The circumference is either 31.2π OR ≈98.0176908. cm
The area is 243.36π cm^2 OR ≈764.537988 cm^2
I HOPE MY ANSWER HELPED PLEASE GIVE BRAINLIEST :)
ASAP HELP TYYY
A purse with a price of $58.45 has an 8% sales tax. What is the sales tax dollar amount?
if we subtract the smallest two digit number from the largest two digit number we get
Answer:
Largest two digit number - smallest two digit number
99-10
89
pls Mark as brainliest
Which statement is true?
A. (1,1) is the x- and y-intercept of the
function.
B. (0,1) is the x- and y-intercept of the function.
C. (0,0) is the x- and y-intercept of the function.
D. The function has no intercepts.
Answer:
C. (0,0) is the x- and y-intercept of the function.
Step-by-step explanation:
It is because the function is passing through the origin.
Help plz I’ll mark brainliest
Answer:
The Answer Is A
Step-by-step explanation:
The table shows the height of a softball that Hallie threw in the air. Is the relationship shown linear? Why or why not?
Answer:
No
Step-by-step explanation:
Because .5 = 7.2
So 1 = 14.4
write the equation for the line that goes through point (12,5) with slope m= -2
Answer:
y=-2x+29
Step-by-step explanation:
y-y1=m(x-x1)
y-5=-2(x-12)
y=-2x+24+5
y=-2x+29
at a farm the ratio of the number of hens to the number of ducks is 3:5 there are 125 ducks at the farm how many hens are there on the farm
3 : 5
x : 125
125 ÷ 5 = 25
25 × 3 = 75
no. of hens = 75
Guys!!! Please help!! Geesh I need help
Answer:
42
Step-by-step explanation:
9 - 4 = 5
8 - 5 = 3
9 + 2 + 3 + 7 + 8 + 3 + 4 + 6 = 42
Answer:
Its 42 ;l
Step-by-step explanation:
PLEASE HELP D:
What is the area of a triangle that has a height of 10 feet and a base length of 8 feet?
A - 10 feet^2
B - 20 feet^2
C - 40 feet^2
D - 80 feet^2
Answer:
C. 40 ft²Step-by-step explanation:
Triangle area formula:
A = bh/2, where b- base, h- heightWe have:
b = 8 ft, h = 10 ftThe area is:
A = 8*10/2 = 40 ft²Correct choice is C
what's nine times 4?
Answer:
9 x 4 = 36
9 multiply by 4 is 36.
Answer:
36
Step-by-step explanation:
If you do 9 * 9 * 9 * 9 you would get 36.
Hence, study your nines. (lol)
Hope this helps! ;)
The graph of a line and and exponential intersect twice, once, or not at all. Describe the possible number of intersections of each of the following pairs of graph. Your solution to each part should include all of the possibilities and a quickly sketched example of each one. (Part 1)(SHOW WORK)
a. A line and a parabola
b. Two different parabolas
a) A line can intersect a parabola at 2 points, 1 point, or no points respectively. The only possible way at which it intersects at 1 point, would be if it were tangent to the parabola. [Check first attachment]
b) Two different parabolas can intersect at 2 points, 1 point or no points respectively. [Check second attachment]
It is possible for 2 parabolas to intersect at 4 and even 3 points. But one of the parabolas would be on it's side. You can consider those cases.
oscar earns extra money, m, working two weekends with his uncle. he is saving to buy a new scooter that costs $138. Fantasia says that Oscar needs to earn more than $7 each hour he works to have enough money to buy the scooter. Explain why she is incorrect.
Answer:
Step-by-step explanation:
30
One angle of an isosceles triangle measures 70°. Which other angles could be in that isosceles triangle?
Answer:
Step-by-step explanation:
The total of all 3 angles in every triangle equals 180 degrees. An isosceles triangle has two side lengths equal and two angle degrees equal.
So you either have two angles with each having 70 degrees and the third angle is 40 degrees,
70 + 70 + 40=180
OR
One angle of 70 degrees and two angles that are 55 degrees each.
70 + 55 +55 =180
Answer:
Step-by-step explanation:The total of all 3 angles in every triangle equals 180 degrees. An isosceles triangle has two side lengths equal and two angle degrees equal. So you either have two angles with each having 70 degrees and the third angle is 40 degrees, 70 + 70 + 40=180OROne angle of 70 degrees and two angles that are 55 degrees each. 70 + 55 +55 =180
A survey found that 68% of students do their homework before 10:00 P.M. Predict how many students out of 1,095 do their homework before 10:00 P.M.
Answer:
744.6 or if you round it 745
Step-by-step explanation:
Step 1: Divide 1095 by 100
In this case, the number that we are "comparing" to 100 is 1095, so we must first normalize the number by dividing it by 100. The operation we have to solve is this:
1095/100= 1095÷100= 10.95
Step 2: Multiply 10.95 by 68 to get the solution
Now that we have our normalized number, 10.95, we just have to multiply it by 68 to get our final answer. The forumla for this is obviously quite simple:
10.95×68= 744.6
The angles of a triangle are (x - 5), (x + 15)°
and (2x + 10). Given that the sum of the
angles of a triangle is 180°, calculate the size
of each angle.
Answer:
35°, 55°, 90°
Step-by-step explanation:
Since all the angles of a triangle equal 180, add them all together and set them equal to 180.
(x-5)+(x+15)+(2x+10)=180
Now solve for each angle.
(40-5)
=35°
(40+15)
=55°
(2(40)+10)
=90°
Now check your work.
35°+55°+90°
=180°
In a triangle, its midsegment is (2x + 8) units long and its parallel side is (5x - 9) units long. How long is the midsegment?
Answer:
The midsegment is 58 units long.
Step-by-step explanation:
Midsegment Theorem:
It states that the length of the midsegment is half the length of the parallel side.
In this question:
Midsegment: 2x + 8
Parallel side: 5x - 9
Parallel side is double the midsegment. So, we use this to find x:
[tex]5x - 9 = 2(2x + 8)[/tex]
[tex]5x - 9 = 4x + 16[/tex]
[tex]x = 25[/tex]
Midsegment:
[tex]2x + 8 = 2(25) + 8 = 50 + 8 = 58[/tex]
The midsegment is 58 units long.
Please help me please
Answer:
2
_
3
Step-by-step explanation:
i think at least hopefully
Write an expression with the same meaning as "7 less than the square of a number."
Answer:
x²-7
Step-by-step explanation:
x²-7
Evaluate each function.
11) f(a) = 3a? + 3a; Find f(a – 2)
PLS SOLVE THIS I WILL GIVE BRAINLIEST BECAUSE THIS IS DUE IN THIRTY MINUTES. I WILL GIVE BRAINLIEST IF YOU ANSWER ALL OF THE PROBLEM.
how many roots does y= x^5- 4x^2+ 3x
A.3
B.4
C.5
D.6
(x^2 is the power to)
Answer: 4
Step-by-step explanation:
We can write the equation as
[tex]x(x-1)^{2}(x^{2}+2x+3)=0\\\\x=0, 1, -1 \pm i\sqrt{2}[/tex]
Therefore, there are 4 distinct roots.
Mi-young is cooking kalguksu for a large family kalgusku is a korean soup with noodles. She makes two kinds of kalguksu,chicken and seafood.
Mi-young makes 24 cups of seafood kalguksu. This is 60% of the total kalguksu she makes
HELP I DONT PAY ATTENTION IN CLASS
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the ratio and percentages.
let's be the total kalguksu soup quantity be x
hence, 60% of x = 24 cups, so we get as
===> 60/100 * x = 24
=> 0.6*x = 24
hence, x ==> 24/0.6
=====> x = 40 cups
hence the answer is 40 cups are in total kalguksu soup.
A fair cube has 2 blue sides, 2 red sides, and 2 green sides.
What is the probability of rolling a blue or red side?
If 70% of a number is 42 and 15% of the same number is 9, find 85% of that number.
Answer: 51
Step-by-step explanation:
let x be the number.
(70%)x = 42
0.7 x = 42
x = 60
we check 15% x 60 = 0.15 x 60 = 9, which is true.
85% of that number = 85% x 60 = 0.85 x 60 = 51.
Answer:
51
Step-by-step explanation: