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3 years ago

A new novel is selling for $17.95. If it is on sale at 40% off, find the amount of discount and the sale price.

Mathematics

1 answer:

nadya68 [22]3 years ago

5 0

Answer:

Step-by-step explanation:

multiply $17.95 by 40% to get the discount ($17.95 x .4), which equals $7.18.

the sale price is the initial price of the book less the discount ($17.95-$7.18), which equals $10.77.

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Please help my brain is fried at the moment but I need to get this done ASAP!

Leviafan [203]

Answer:

$3^34^4$

Step-by-step explanation:

Since you multiply 3 by itself 3 times, that becomes $3^3$ and since you multiply 4 by itself 3 times, that becomes $4^3$ .

The final product is $3^34^4$ .

6 0

3 years ago

This is the one and i know its probably super easy but i dont know

DENIUS [597]

Step-by-step explanation:

this one is a "thousand times" more complex than the inequality question to put there.

still easy, yes, for an experienced person, but here it is clear you need to understand lines, coordination grids, and overall deal with 2 variables (here : x and y) and therefore 2 dimensions.

the general line function is typically presented as

y = ax + b

a is the slope. that is the ratio of "y coordinate change / x coordinate change" when going from one point on the line to another.

and b is the y-intercept (the y value when x = 0), giving us the information about the point, where the line crosses the y-axis.

and so, look for yourself, which of the 4 equations has a b of +3 ?

y = 3x no, b = 0

y = x + 3 yes, b = 3, this is correct

y + 3 = x hmm. let's first bring it into the normed form

y = x - 3 aha ! no, b = -3

y = x - 3 no, the same thing as before. b = -3

3 0

2 years ago

Which side lengths form a right triangle?Choose all answers that apply: (Choice A) 2 , 1 5 , 1 7 Choice B) 1 , 8 , square root o

iren [92.7K]

Answer:

B, but I can't read C

Step-by-step explanation:

the sum of any 2 sides must be longer that the 3rd.

A is not correct, 2 + 15=17, needs to be greater.

B 1, 8, 8.1 so yes as 1+8 >8.1

C 2, 8.9, I cna't tell if that last number is 9 or 92?

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3 years ago

Walter walked 15.5 blocks from his house to work. It took him 35 minutes. What is his rate in blocks per hour?

Naddik [55]

26.57 block per hour

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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:

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

The values are x = -2 and y = 1/2.

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.

Answer:

i) det(A) = -12

ii) A is not singular because singular matrices have determinant equal to zero.

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.

6 0

1 year ago