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3 years ago

Round each number to the nearest tenth.

2 answers:

7 0

47.82 is rounded to 47.8 because the '2' in the hundredths column means you round down. The same goes for 74.31- it becomes 74.3 because the '1' in the hundredths column means you round down.

47.8+74.3= 122.1

avanturin [10]3 years ago

4 0

122.1 or 122
becuase the original answer is 122.13 and the 3 gets out becuase it rounds down and so does the 1

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Ax+by=(a-b) , bx - ay =(a+b) simultaneous linear equations using cross multiplication

Molodets [167]

Answer:

$x=1\,,\,y=-1$

Step-by-step explanation:

Given: $ax+by=a-b\,,\,bx-ay=a+b$

To solve: the given linear equations

Solution:

Consider the equations:

$A_1x+B_1y+C_1=0\\A_2x+B_2y+C_2=0$

By method of cross multiplication:

$\frac{x}{B_1C_2-B_2C_1}=\frac{y}{C_1A_2-C_2A_1}=\frac{1}{A_1B_2-A_2B_1}$

For equations: $ax+by=a-b\,,\,bx-ay=a+b$

$ax+by-(a-b)=0\\bx-ay-(a+b)=0$

Take $A_1=a\,,\,B_1=b\,,\,C_1=-(a-b)\,,\,A_2=b\,,\,B_2=-a\,,\,C_2=-(a+b)$

So,

$\frac{x}{-b(a+b)-a(a-b)}=\frac{y}{-b(a-b)+a(a+b)}=\frac{1}{-a^2-b^2}\\\frac{x}{-ab-b^2-a^2+ab}=\frac{y}{-ab+b^2+a^2+ab}=\frac{1}{-(a^2+b^2)}\\\frac{x}{-(a^2+b^2)}=\frac{y}{a^2+b^2}=\frac{1}{-(a^2+b^2)}\\\frac{x}{-(a^2+b^2)}=\frac{1}{-(a^2+b^2)}\,,\,\frac{y}{a^2+b^2}=\frac{1}{-(a^2+b^2)}\\x=1\,,\,y=-1$

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3 years ago

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PtichkaEL [24]

Answer:

Step-by-step explanation:

possible outcomes for choosing one marker is 1/19

so there for the answer is A

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4 years ago

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Morgarella [4.7K]

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Answer: -8

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2 years ago

Question 4 (1 point)

serious [3.7K]

Answer:

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Step-by-step explanation:

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3 years ago

Determine the slope of the following graph.

evablogger [386]

Answer:

2/1 or 2

Step-by-step explanation:

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