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3 years ago

Please help Needed ASAP WILL GIVE BRAINLIEST AND POINTS

Mathematics

2 answers:

borishaifa [10]3 years ago

7 0

Answer:

Hope this helps :D

Step-by-step explanation:

Answer to question .2

Girls-226

Boys-295

Boys with glasses- 210

Girls with glasses- 104

Difference Between boys and girls- 69

Difference between boys with glasses and no glasses-85

Difference between girls with glasses and no glasses-122

Anton [14]3 years ago

6 0

[Problem 2]

-> Girls = 226

-> Boys = 295

-> Girls with glasses = 104

-> Boys with glasses = 210

-> Difference of total boys and girls = 69

-> Difference of boys with glasses vs without glasses = 85

-> Difference of girls with glasses vs without glasses = 122

-> <em>It is hard to create a table over Brainly</em>

[Problem 4] Answer is 4.3

-> To find the mean absolute deviation, we will find the mean of the data and then see how far away each point is, and then find the mean of those values

-> Finding mean: $\frac{38+46+52+44+47+55}{6}$ = 47

-> All the values (all of the values will be absolute values, why the word absolute is there, so ignore all negative signs!)

38 - 47 = 9

46 - 47 = 1

52 - 47 = 5

44 - 47 = 3

47 - 47 = 0

55 - 47 = 8

-> Then, we will find the mean of these values: $\frac{8+0+3+5+1+9}{6}$ = 4 $\frac{1}{3}$

-> 4 $\frac{1}{3}$ = 4.33333 and when rounded to the nearest tenth is 4.3

Have a nice day!

I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

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Explain how you know that 88 is a solution to the equation 18x=11 by completing the sentences: The word "solution" means . . . 8

koban [17]

Correct Question:

Explain how you know that 88 is a solution to the equation 1/8x =11 by completing the sentences:

The word "solution" means . . .

88 is a solution to 1/8x=11 because . . .

Answer/Step-by-step explanation:

✔️The word solution means the value of the unknown variable, x. This means, when the value of x is substituted into the equation, the equation becomes balance as the value on the left equals the value on the right.

✔️88 is a solution to ⅛x = 11 because:

if we substitute x for 88 into the equation, both sides would be equal.

Thus:

⅛×88 = 11

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3 years ago

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Pani-rosa [81]

Answer:

15549 yrs old

Step-by-step explanation:

To find the decay constant r we use the formula

t1/2 = 0.693/r

t1/2 is the half-life 5700

5700 = 0.693/r

r = 0.693/5700 = 0.000122 per sec

For the 15% remaining from an initial value of 100%, time t is calculated from

N = Noe^(-rt)

0.15 = 1e^(-0.000122t)

we take natural log of both sides

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3 years ago

10. (a) Consider the following matrices: A = ( 2 ) B = (3) and C = (-3) w = Find the det(A). [1] (ii) Is the matrix A singular?

Viefleur [7K]

i) We have to find the determinant of A.

We can do this as:

$\det(A)=|\begin{bmatrix}{3} & {6} \\ {1} & {-2}\end{bmatrix}|=3*(-2)-6*1=-6-6=-12$

ii) We have to find if the matrix A is singular.

Singular matrix have determinant equal to 0.

This is not the case for A, as its determinant is -12. Then, A is not a singular matrix.

iii) We have to find the values of x and y so that AB = C.

We have to write the matrix multiplication and we will obtain a system of linear equations:

We can now solve the system of equations by adding 3 times the second equation to the first equation:

$\begin{gathered} 3(x-2y)+(3x+6y)=3(-3)+(-3) \\ 3x-6y+3x+6y=-9-3 \\ 6x+0y=-12 \\ x=\frac{-12}{6} \\ x=-2 \end{gathered}$

We can now use the second equation to find the value of y:

$\begin{gathered} x-2y=-3 \\ x+3=2y \\ y=\frac{x+3}{2} \\ y=\frac{-2+3}{2} \\ y=\frac{1}{2} \end{gathered}$

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iv) When we want to multiply two matrices, the required condition is that the number of columns of the matrix on the left is equal the number of rows of the matrix on the right.

In the case of A(2x2) and B(2x1), when we do A*B this condition is satisfied.

But when we try to multiply BA, the number of columns of B is not equal to the number of rows of A, so the matrix mulitplication is not possible.

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i) det(A) = -12

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iii) x = -2 and y = 1/2.

iv) Is not possible because the number of columns of the first matrix has to be equal to the number of rows of the second matrix.

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Klio2033 [76]

Answer:

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