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3 years ago

Need help on 1 and 7 please giving out 19 points

Mathematics

1 answer:

Serjik [45]3 years ago

4 0

Answer:

for number one the answer is no for 7 the answer is 5 seconds

Step-by-step explanation:

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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

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

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

4 0

3 years ago

Help me with this one math problem:)

Lisa [10]

Answer:

1/2

Step-by-step explanation:

It rises 1 and goes 2 units to the left, which is what rise/run means

And a tip:

I can tell you're using Goggle Forms. If you hit ctrl + U, you can find the answers to the questions in the code

4 0

2 years ago

Kim paid

Anna11 [10]

Answer:

Sherri paid the most

Step-by-step explanation:

35% > 33%

3 0

3 years ago

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Tom predicted that the Giants would score three 3-point field goals, score two 6-point touchdowns, and score 1 extra point. If T

Bingel [31]

3*3 = 9

2*6 = 12

1*1 = 1

9+12+1 = 22

The Giants would score 22 points if Tom is correct

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3 years ago

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Matt has answered 20/25 of the question on a test . What percent of test Questions has Matt answers

sergey [27]

you need to make the fraction to 100

100/25=

you multiply 20x4

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3 years ago

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