Please help me!!! ASAP!!1. what is the solution of the matrix equation ?
[9 4] x= [-9 -6]
[2 1] [-1 -8]
A. [5 -26]
[9 -60]
B. [-5 26]
[-1 -8]
C. [-5 26]
[9 -60]
D. [9 26]
[9 1]
solve the system
{ 2x +y - 4z = -30
{ 3x + 2y +2z =-8
{5x + 5y + z = -26
A. (-30,-8,-26)
B.(4,-2,4)
C. (-4,-2,4)
D.(-4,2,-4)
Answers
Find the determinant;
9*1- 2*4= 1
Inverse of the matrix;
1(
Pre-multiplying the matrix by the inverse on both the left hand side and the right hand side gives the answer above.
Related Questions
GUYS, PLEASE HELP!!! THIS IS REALLY NEEDED! (20 POINTS!)The area of a square is (16x2 − 8x + 1) square units. Determine the length of each side of the square by factoring the area expression completely. Show your work.
Solve the inequality 2(x-3)-5x<9
Evaluate :- a) (6.4)² - (3.6)²
I NEED HELP!!! THE QUESTIONS AND THE ANSWERS ARE DOWN BEELOW!!!
Answers
3/8 = 9/24
16/24 – 9/24 = 7/24
Your answer is 7/24
Answer:
Your answer is 7/24
Step-by-step explanation:
Answers
Answer:
A.
Step-by-step explanation:
0.0973, 0.1627.
The answer should be a polynomial in standard form.
Answers
(8a² - 6ab + 4b²) - (3a² + 5ab - 4b²) distribute the negative sign and combine like terms
(8a² - 6ab + 4b²) (-3a² - 5ab + 4b²)
8a² and -3a² equals 5a²
-6ab and -5ab equals -11ab
4b² and 4b² equals 8b²
the answer is 5a² - 11ab + 8b²
Hope this helps!!
25
85
150
128
Question 4 (Multiple Choice Worth 5 points)
(08.01)Mark wants to know how many families in his neighborhood plan to attend the neighborhood party. He puts all 80 of the neighborhood addresses in a hat and draws a random sample of 20 addresses. He then asks those families if they plan to attend the party. He finds that 20% of the families plan to attend the party. He claims that 20% of the neighborhood families would be expected to attend the party. Is this a valid inference?
No, this is not a valid inference because he asked only 20 families
No, this is not a valid inference because he did not take a random sample of the neighborhood
Yes, this is a valid inference because he took a random sample of the neighborhood
Yes, this is a valid inference because the 20 families speak for the whole neighborhood
Answers
A)The number of students in the seventh grade who would be expected to prefer math to science are: 128
B) The true statement about the inference is (c) Yes, this is a valid inference because he took a random sample of the neighborhood
What is sample?
A sample refers to a smaller, manageable version of a larger group. It is a subset containing the characteristics of a larger population.
A) Given that, the total number of students in seventh grade are: 150 students.
Now he took a sample of 25 students and find that the 85% of the sample prefers math to science.
This means that out of the sample the number of students who prefer math to science is:
= 85 / 100 x 25
= 21.25
Now, out of the total seventh graders the number of students who prefer math to science is:
21.25 x 150 / 25 = 127.5 ≈ 128
B) From the question, we understand that:
Mark draws a random sample of 20 addresses from all 80 of the neighborhood addresses.
The above selection is a random sampling technique
Therefore, the true statement about the inference is (c) Yes, this is a valid inference because he took a random sample of the neighborhood
Learn more about samples, click;
#SPJ3
Option 1 : 25
Option 2 : 85
Option 3 :150
Option 4 :128
Solutions - Convert the percent into decimal and multiply.
85% of 150 = 0.85 * 150
= 127.5 which is rounded to 128
Part 2 : Mark wants to know how many families in his neighborhood plan to attend the neighborhood party. He puts all 80 of the neighborhood addresses in a hat and draws a random sample of 20 addresses. He then asks those families if they plan to attend the party. He finds that 20% of the families plan to attend the party. He claims that 20% of the neighborhood families would be expected to attend the party. Is this a valid inference?
No, this is not a valid inference because he asked only 20 families
No, this is not a valid inference because he did not take a random sample of the neighborhood
Yes, this is a valid inference because he took a random sample of the neighborhood
Yes, this is a valid inference because the 20 families speak for the whole neighborhood
Solutions : Plans to attend doesn't mean they would come. It is a 50/50 chance. 2/8 * 100% is 25%.
Answer = (C) = Yes, this is a valid inference because he took a random sample of the neighborhood
Answers
Hi Mark
3x+y=4
2x+y=5
Solve 3x+y=4 for y
Add -3x to both sides
3x+y-3x=4-3x
y=-3x+4
Substitute -3x+4 for y in 2x+y=5
2x+y=5
2x-3x+4=5
Simplify both sides of the equation
-x+4=5
Add -4 to both sides
-x+4-4=5-4
-x=1
Divide both sides by -1
-x/-1= 1/-1
x=-1
Substitute -1 for x in y=-3x+4
y=-3x+4
y=(-3)(-1)+4
Simplify both sides of the equation
y=7
Answer: (-1,7)
I hope that's help ! Have a great weekend :)
Answers
Answer: Hope it helps...
Step-by-step explanation: mark as an brainliest... if so