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3 years ago

If x= -3 what is the value of 30+4x ? 42 28 18 31

Mathematics

2 answers:

matrenka [14]3 years ago

8 0

Answer:18

Step-by-step explanation:4(-3) = -12, and 40-12=18

ra1l [238]3 years ago

8 0

Answer:

Step-by-step explanation:

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What’s the answer? (picture)

Tems11 [23]

I think it would be B i’m sorry if it’s wrong have a good day!

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3 years ago

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

If lisa has 2,134 buttons that needed to be sorted equally into 12 jars.How many buttons will be in each jar.

ch4aika [34]

Answer:

Either 177 or 188 buttons

Step-by-step explanation:

2134/12=177.83

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3 years ago

Negative 5 1 half plus 7 3 over 4

erastovalidia [21]

Answer:

$2 \dfrac{1}{4}$

Step-by-step explanation:

$-5 \dfrac{1}{2} + 7 \dfrac{3}{4} =$

$= -5 \dfrac{2}{4} + 7 \dfrac{3}{4}$

$= 7 \dfrac{3}{4} - 5 \dfrac{2}{4}$

$= 2 \dfrac{1}{4}$

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2 years ago

The following absolute value inequality is an example of a conjunction.

umka2103 [35]

The answers is false

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3 years ago