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kozerog [31]
3 years ago
12

You want to know the type of music listened to by 15- to 20-year-olds. Which of the following surveys is biased?

Mathematics
1 answer:
Liula [17]3 years ago
6 0
 Arguably, all of them are at least somewhat biased, but the most biased would be <span>surveying people 15 to 20 years old leaving a concert </span>  because being at a concert would be highly correlated with liking the type of music played at that concert.
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When 31 times a number is increased by 40 the answer is the same as two 200 is decreased by the number
storchak [24]
x-\ number\\\\&#10;31x+40=200-x\ \ \ | add\ x\\\\&#10;32x+40=200\ \ \ | subtract\ 40\\\\&#10;32x=160\ \ \ \ | divide\ by\ 32\\\\x=5\\\\Number\ is\ 5.
4 0
3 years ago
Express the radical using the imaginary unit, i
Kipish [7]

Answer:

7i.

Step-by-step explanation:

Note : The given expression must be \sqrt{-49}.

We have to write this radical value in the imaginary value.

The given value can be rewritten as

\sqrt{-49}=\sqrt{49\times (-1)}

\sqrt{-49}=\sqrt{49}\times \sqrt{-1}    [\because \sqrt{ab}=\sqrt{a}\sqrt{b}]

\sqrt{-49}=7\times i    [\because \sqrt{-1}=i]

\sqrt{-49}=7i

Therefore, the required expression is 7i.

8 0
3 years ago
Six friends equally share the cost of a gift. They pay $90 and receive $42 in charge . How much does each friend pay?
sergij07 [2.7K]

Answer:

$8.00

Step-by-step explanation:

Let's set up the equation first.

What do we know:

1. We have 6 friends spliting the costs of the gifts

2. After purchasing the gifts they have $42 in change

3. They originally had $90 to spend.

Equation:

6f + $42 = $90

Next: Subtract the $42 from each side and we are left with:

6f = $48

Divide both sides by 6 and we are left with

f = $8

Since f represented the cost each friend spent our answer is $8.00

3 0
2 years ago
To decrease an amount by 7%, what single multiplier would you use?
Fofino [41]

To decrease something at 100% by 7% is:

100% - 7% = 93%

You multiply the original value by 0.93 to decrease it from it's original value by 7%

7 0
3 years ago
Expand and simplify<br> 3(4a - 5b) + 2(2a - 3b)
mafiozo [28]

Answer:

a = 5/2

b = 1

I hope it correct

Step-by-step explanation:

Thank you

5 0
2 years ago
Read 2 more answers
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