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3 years ago

Someone pls help me with this question pls it will help me so much thank you !:)

Mathematics

1 answer:

sasho [114]3 years ago

4 0

Answer:

50%

Step-by-step explanation:

Percent change is (final - initial) / initial

(120 - 80)/80 = 40/80 = 0.5 = 50%

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Using Cramer's rule to solve linear systems.

Rzqust [24]

Answer: Last Option

$x=2,\ y=-5$

Step-by-step explanation:

Cramer's rule says that given a system of equations of two variables x and y then:

$x =\frac{Det(A_X)}{Det(A)}$

$y =\frac{Det(A_Y)}{Det(A)}$

For this problem we know that:

$Det(A) = |A|=\left|\begin{array}{ccc}4&-6\\8&-2\\\end{array}\right|$

Solving we have:

$|A|= 4*(-2) -(-6)*8\\\\|A|=40$

$Det(A_X) = |A_X|=\left|\begin{array}{ccc}38&-6\\26&-2\\\end{array}\right|$

Solving we have:

$|A_X|=38*(-2) - (-6)*26\\\\|A_X|=80$

$Det(A_Y) = |A_Y|=\left|\begin{array}{ccc}4&38\\8&26\\\end{array}\right|$

Solving we have:

$|A_Y|=4*(26) - (38)*8\\\\|A_Y|=-200$

Finally

$x =\frac{|A_X|}{|A|} = \frac{80}{40}\\\\x=2$

$y =\frac{|A_Y|}{|A|} = \frac{-200}{40}\\\\y=-5$

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3 years ago

Which statement best defines work?

Amiraneli [1.4K]

Answer:

1. work is the time it takes to move an object once acted upon by a force

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3 years ago

Julia went to 10 houses on her street for Halloween. 5 of the houses gave her a chocolate bar. What fraction of houses on Julia’

Mnenie [13.5K]

Answer:

1/2

Step-by-step explanation:

5/10 houses gave her chocolate

if you simplify 5/10 by dividing by both the top and bottom by 5 to get 1/2

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3 years ago

Read 2 more answers

How do you solve -3+r/3=-5

MAVERICK [17]

Answer:

r=-6

Step-by-step explanation:

Question: -3+r/3=-5

1) Multiply both sides of the equation by 3:

-9+r=-15

2) Add 9 to both sides:

r=-6

Footnotes:

1) In step 1 when I multiplied both sides of the equation by 3, don't forget you also have to multiply -3 by 3 because it is not part of the fraction (which is how I got -9)

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3 years ago

A + (-25)=75 <br> Solve the equation

gogolik [260]

You can rewrite this as A - 25 = 75. You always can cancel adding a negative into just subtracting, and although it may not seem important yet, it’s a good habit to get into for further algebra.
A = 100.

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4 years ago