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3 years ago

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Kimberly has $80. She wants to purchase a school bag for $16 and several pairs of shoes. Each pair of shoes is $8. Write an ineq

uality for the number of shoes she can purchase

2 answers:

user100 [1]3 years ago

5 0

80 = 16 + 8x
x represents the number of pair of shoes she can purchase.

Hope this helps you! (:
-Hamilton1757

sattari [20]3 years ago

5 0

80-16+8(x) is your answer

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(? x 3) - 3 = 15<br><br>help pls and i need the steps :/

marishachu [46]

Answer:

4

Step-by-step explanation:

Lets make $x$ be the ? in the equation.

That becomes ( $x$ x 3) - 3 = 15.

First you have to add 3 on both sides. After doing that it gets to ( $x$ x 3) = 15 - 3.

Then you simplify it to 3 $x$ = 12.

Now you divide 3 on both sides. That gets to $x$ = 4 after doing it.

Hope this helped! If not, please let me know! <3

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4 years ago

Twice the difference of 3x and y increased by 5 times the sum of x and 2y

Phantasy [73]

The answer is 2(3x-y)+5(x+2y).

8 0

3 years ago

A = ???? 4 −2

irinina [24]

Answer:

1. The matrix A isn't the inverse of matrix B.

2. |B|=12, |A|=12

Step-by-step explanation:

1. We want to know if matrix A is the inverse of matrix B, this means that if you do the product between B and A you have to obtain the identity matrix.

We have:

$A=\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]$

and

$B=\left[\begin{array}{cc}3&2\\1&4\end{array}\right]$

A and B are 2×2 matrices (2 rows and 2 columns), if you multiply them you have to obtain a 2×2 matrix.

Then if A is the inverse of B:

$B.A=I$

Where,

$I=\left[\begin{array}{cc}1&0\\0&1\end{array}\right]$

Observation:

If you have two matrices:

$A=\left[\begin{array}{cc}a&b\\c&d\end{array}\right]\\and\\B=\left[\begin{array}{cc}e&f\\g&h\end{array}\right]\\\\\\A.B=\left[\begin{array}{cc}(a.e+b.g)&(a.f+b.h)\\(c.e+d.g)&(c.f+d.h)\end{array}\right]$

Now:

$B.A=\left[\begin{array}{cc}3&2\\1&4\end{array}\right].\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}4.3+(-2).1&4.2+(-2).4\\(-1).3+3.1&(-1).2+3.4\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}12-2&8-8\\-3+3&-2+12\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}10&0\\0&10\end{array}\right]$

$B.A=\left[\begin{array}{cc}10&0\\0&10\end{array}\right]\neq \left[\begin{array}{cc}1&0\\0&1\end{array}\right]=I\\\\\\B.A\neq I$

Then, the matrix A isn't the inverse of matrix B.

2. If you have a matrix A:

$A=\left[\begin{array}{cc}a&b\\c&d\end{array}\right]$

The determinant of the matrix is:

$|A|=ad-bc$

Then the determinant of B is:

$B=\left[\begin{array}{cc}3&2\\1&4\end{array}\right]$

$a=3, b=2, c=1, d=4$

$|B|=3.4-2.1\\|B|=12-2=10$

The determinant of A is:

$A=\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]$

$a=4, b=-2, c=-1, d=3$

$|A|=4.3-(-2).(-1)\\|B|=12-2=10$

6 0

4 years ago

which measurement would be lest likely to be written in scientific notation: the thickness of a dog, the radius of a period on t

Dafna11 [192]

The radius of a period on this page

This is because people usually write numbers that are very big/small as a scientific notation. (The radius of a period on this page is small)

6 0

4 years ago

FIND THE DISTANCE BETWEEN THE POINTS. ROUND THE ANSWER TO TWO DECIMAL POINTS (3,2) (8,2)

defon

Answer:5

Step-by-step explanation:

If you are looking for the distance then start counting on the first decimal and stop at the second

5 0

3 years ago