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3 years ago

10

1ь - 1 1

align="absmiddle" class="latex-formula">

1 answer:

kvv77 [185]3 years ago

6 0

Answer:

For equation 21-b=11 given in the statement

the answer is b=10

Step-by-step explanation:

This is the equation: 21-b=11

If we sum '-21' to both sides of equation, we have

21-b-21=11-21, which leaves us to: -b=-10

Now lets multiply the equation from above by '-1', we obtain that b=10

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PLEASE HELP/ANSWER! From 1980 to 1990, Lior’s weight increased by 25%. If his weight was k kilograms in 1990, what was it in 198

Elena-2011 [213]

The weight in 1980 is $\frac{4k}{5}$ kilograms

<em><u>Solution:</u></em>

From 1980 to 1990, Lior’s weight increased by 25%

His weight is "k" kilograms in 1990

<em><u>To find: weight in 1980</u></em>

This is a percentage increase problem

Let "x" be the weight in kilograms in 1980

<em><u>The percentage increase is given by formula:</u></em>

$\text{Percentage increase } = \frac{\text{Final value - initial value}}{\text{initial value}} \times 100$

Here,

Initial value in 1980 = x

Final value in 1990 = k

Percentage increase = 25 %

<em><u>Substituting the values in formula,</u></em>

$25 = \frac{k-x}{x} \times 100\\\\25x = 100(k-x)\\\\x = 4(k-x)\\\\x = 4k - 4x\\\\5x = 4k\\\\x = \frac{4k}{5}$

Thus the weight in kilograms in 1980 is $\frac{4k}{5}$

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3 years ago

I have five numbers, the mean is 6, and the mode is 7 what could these numbers be?

storchak [24]

Answer:

3, 5, 7, 7, 8

Step-by-step explanation:

3, 5, 7, 7, 8

the mean = (3+5+7+7+8)/5 = 30/5= 6

the mode = 7

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3 years ago

25 mice were involved in a biology experiment involving exposure to chemicals found in ciggarette smoke. 15 developed at least 1

MAVERICK [17]

based on the number of mice that took part in the experiment, the total number of mice that had at least one effect is 20 mice.

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question is:

what are the number of mice with at least one effect?

find out more on effects of smoking at brainly.com/question/12135800.

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2 years ago

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Answer:

hello,

answer C

Step-by-step explanation:

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3 years ago

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Answer:

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Step-by-step explanation:

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