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storchak [24]
4 years ago
5

Please help me i need this ASAP PLZ

Mathematics
1 answer:
Virty [35]4 years ago
3 0

What you need help on, like what do you need bro

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each morning, danai buys breakfast on her why to work. In the past thirty days, she bought a bagel on 6 days, a banana on 12 day
Ksju [112]

Answer:

  • 0.7 or 70%

Step-by-step explanation:

Total number of days

  • 6 + 12 + 3 + 9 = 30

The number of days she bought a banana or orange

  • 12 + 9 = 21

The probability of buying a banana or an orange is

  • P(b or o) = 21/30 = 0.7 = 70%
8 0
2 years ago
Jacob solves the system of equations by forming a matrix equation.
Lyrx [107]

Simultaneous equations can be solved using inverse matrix operation.

The complete steps of Jacob's solution are:

\left[\begin{array}{cc}4&1\\-2&3\end{array}\right]^{-1} \cdot \left[\begin{array}{cc}4&1\\-2&3\end{array}\right]\left[\begin{array}{c}x&y\end{array}\right] = \frac{1}{14}\left[\begin{array}{cc}3&-1\\2&4\end{array}\right] \cdot \left[\begin{array}{c}2&-22\end{array}\right]

\left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{cc}4&1\\-2&3\end{array}\right] \cdot \left[\begin{array}{c}2&-22\end{array}\right]

\left[\begin{array}{c}x&y\end{array}\right] = \frac{1}{14} \left[\begin{array}{c}28&-84\end{array}\right]

\left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{c}2&-6\end{array}\right]

We have:

4x + y = 2

-2x + 4y = -22

Calculate the determinant of \left[\begin{array}{cc}4&1\\-2&3\end{array}\right]

|A| = 4 \times 3 -1 \times -2

|A| = 12 +2

|A| = 14

So, the inverse matrix becomes

A = \frac{1}{14}\left[\begin{array}{cc}4&1\\-2&3\end{array}\right]

Replace the first column with \left[\begin{array}{c}2&-22\end{array}\right] to calculate the value of x

x = \frac{1}{14}\left[\begin{array}{cc}2&1\\-22&3\end{array}\right]

So, we have:

x = \frac{1}{14}(2 \times 3 - 1 \times -22)

x = \frac{1}{14}(6 +22)

x = \frac{1}{14}(28)

x = 2

Replace the second column with \left[\begin{array}{c}2&-22\end{array}\right] to calculate the value of y

y = \frac{1}{14}\left[\begin{array}{cc}4&2\\-2&-22\end{array}\right]

So, we have:

y = \frac{1}{14}(4 \times -22 - 2 \times -2)

y = \frac{1}{14}(-88 +4)

y = \frac{1}{14}(-84)

y = -6

Hence, the complete process is:

\left[\begin{array}{cc}4&1\\-2&3\end{array}\right]^{-1} \cdot \left[\begin{array}{cc}4&1\\-2&3\end{array}\right]\left[\begin{array}{c}x&y\end{array}\right] = \frac{1}{14}\left[\begin{array}{cc}3&-1\\2&4\end{array}\right] \cdot \left[\begin{array}{c}2&-22\end{array}\right]

\left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{cc}4&1\\-2&3\end{array}\right] \cdot \left[\begin{array}{c}2&-22\end{array}\right]

\left[\begin{array}{c}x&y\end{array}\right] = \frac{1}{14} \left[\begin{array}{c}28&-84\end{array}\right]

\left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{c}2&-6\end{array}\right]

Read more about matrices at:

brainly.com/question/11367104

6 0
3 years ago
Which inequality is true for x = 6?
KengaRu [80]
The answer is option c
7 0
3 years ago
Read 2 more answers
Using the digits 0-9, no more than one time each, place a digit in a box to create an equation with a solution x= -1/2
Brums [2.3K]

Three equations are:

2x+1=6x+3

8x+6=2x+3

8x+4=2x+1

<u>Step-by-step explanation:</u>

Using the digits 0-9, no more than one time each, place a digit in a box to create an equation with a solution x= -1/2  . We need to  Create three equations. Formula is below.  __ x+ __=__ x+ __ .  Let's find out:

2x+1=6x+3

Let's verify this :

⇒ 2x+1=6x+3

⇒ 4x=-2

⇒ x=\frac{-1}{2}

8x+6=2x+3

Let's verify this :

⇒ 8x+6=2x+3

⇒ 6x=-3

⇒ x=\frac{-1}{2}

8x+4=2x+1

Let's verify this :

⇒ 8x+4=2x+1

⇒  6x=-3

⇒ x=\frac{-1}{2}

7 0
3 years ago
A limo driver needs to make more than $450 in one day. He charges a rental fee of $375 and $0.85 per mile. What inequality repre
spin [16.1K]

Answer:

.

Step-by-step explanation:

0.85x + 375 > 450

5 0
3 years ago
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