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3 years ago

Louise made 80% of what he made last week. If he made $72 this week, how much would you make last week?

Mathematics

2 answers:

Dimas [21]3 years ago

7 0

Louise made $90 last week

erma4kov [3.2K]3 years ago

4 0

72$ = 80%
x$ = 100%
x=(72×100)÷80=90
90$
To check:
90$×0.80=72$
Answer: 90$

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Determine the value of x.<br> x feet<br> 14 feet<br> 48 feet

Citrus2011 [14]

Answer:50 feet

142+482=502

196+2304=2500

Step-by-step explanation:

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3 years ago

Best Buy claims that 68% of people that walk into one of their stores end up not purchasing an item. To test this, they randomly

Tema [17]

Answer:

Yes.

Step-by-step explanation:

As long as the individual's that have been selected as part of the study were actually selected randomly then yes. If there was no bias or other external factors affecting the probability of getting chosen then these individual's would clearly represent the entire population of Best Buy customers. Therefore, if the data gathered from these individuals results in being 68% of that population that does not buy anything then this would result in a valid claim by Best Buy.

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3 years ago

If A is nonsingular, then (AT )-1 =(A-1) T . (a) Verify this theorem for 2 × 2 matrices

kipiarov [429]

Answer:

Verified

Step-by-step explanation:

Let the 2x2 matrix A be in the form of:

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

Where det(A) = ad - bc # 0 so A is nonsingular:

Then the transposed version of A is

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

Then the inverted version of transposed A is

$(A^T)^{-1} = \frac{1}{ad - cb} \left[\begin{array}{cc}a&-c\\-b&d\end{array}\right]$

The inverted version of A is:

$A^{-1} = \frac{1}{ad - bc}\left[\begin{array}{cc}a&-b\\-c&d\end{array}\right]$

The transposed version of inverted A is:

$(A^{-1})^T = \frac{1}{ad - bc}\left[\begin{array}{cc}a&-c\\-b&d\end{array}\right]$

We can see that

$(A^T)^{-1} = (A^{-1})^T$

So this theorem is true for 2 x 2 matrices

3 0

3 years ago

Write the Rational Expression in simplest form. <img src="https://tex.z-dn.net/?f=%5Cfrac%7Bx%5E2-x-6%7D%7B24-5x-x%5E2%7D" id="T

Liula [17]

Answer:

-(x+2)/(x+8)

Step-by-step explanation:

( x^2 -x-6)

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24 - 5x -x^2

Factor out a minus sign from the denominator

( x^2 -x-6)

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-( x^2 +5x -24)

Factor the numerators and the denominators

( x-3) (x+2)

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-( x+8)(x-3)

Cancel like terms

x+2

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-(x+8)

4 0

3 years ago

Lshonda sells beaded necklaces. Each large necklace sells for 4.70 and each small necklace sells for 4.20. How much will she ear

AysviL [449]

Answer: Lshonda will earn $23.

Step-by-step:
The equation would be (4•4.7) + (1•4.2)
4 multiplied by 4.7 is 18.8
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hope this helps! :)

7 0

3 years ago