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Mathematics

2 answers:

Eddi Din [679]4 years ago

8 0

Answer:

Difference of Expression

5a+ 3b -6c -( 20 -4b +13c)

= 5a +3b -6c -20 +4b -13c

= 5a +3b +4b -6c -13c -20

= 5a +7 b - 19 c -20

TiliK225 [7]4 years ago

7 0

In this question, you would be solving the expression by combining like terms.

Solve:

(5a + 3b - 6c) - (20 - 4b + 13c)

Distribute the negative to the variables inside the parenthesis.

5a + 3b - 6c - 20 + 4b - 13c

Combine like terms.

5a + 7b - 6c - 20 - 13c

5a + 7b - 19c - 20

You can't combine anymore like terms now, so your answer would be 5a + 7b - 19c - 20

Answer:

5a + 7b - 19c - 20

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For the data in the table does y vary directly with x? X=16,32,48-Y=4,16,36

disa [49]

Data:

x          y

16        4

32      16

48      36

Direct relation means that the ratio y / x is constant.

So, let's examine this ratio:

Ratio y / x

4/16 = 1/4

16/32 = 1/2

36/48 = 3/ 4

Given that the ratio y/x is not constant, the conclusion is that y does not vary directly with x.

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3 years ago

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Terry scored 71, 80, and 86 on his first three history tests. What must terry score on the fourth test to have a mean of exactly

Kaylis [27]

Answer:

Step-by-step explanation:

You are trying to find the score that gives you a specific mean. A mean is calculated by dividing the sum of the data by the amount of data. Set up in this order, with x as the fourth score, to find the answer.

$\frac{71+80+86+x}{4}=80\\\frac{237+x}{4} =80\\237+x=320\\x=83$