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3 years ago

System of equations -3x-4y=2 3x+3y=-3

Mathematics

1 answer:

Mashutka [201]3 years ago

4 0

If you add the two equations together,
Ex:
-3x-4y=2
+ 3x+4y=-3
————————
0=-1

So there is no solution

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Alex is conducting a survey for a car company. She decides to start by interviewing some people in her neighborhood. She prepare

fiasKO [112]

Answer:

2. Alex sent the questionnaire only to those who live near her.

Step-by-step explanation:

Given scenario is :

Alex is conducting a survey for a car company. She decides to start by interviewing some people in her neighborhood.

She prepares a questionnaire and emails it to 50 neighbors who own cars. Of those neighbors, 24 respond.

We can see that Alex sent the questionnaire to only her neighbors or people who live near her, so this will be the reason the sample will be biased.

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3 years ago

A cable company wants to provide cell phone service for residents on an island. The function for the cost of laying the cable fr

laila [671]

Answer:

C) domain: all real numbers greater than or equal to 0

range: all real numbers greater than or equal to 13,000

Step-by-step explanation:

We have, the function for the cost of laying cable is given by,

$c(x)= 6500\sqrt{x^2+4}$ , where x is the length of the cable (in feet).

As, 'x' represents the length of the cable.

We have that, the value of x cannot be negative.

So, x ≥ 0.

Since, the domain of $c(x)= 6500\sqrt{x^2+4}$ is the set of points where $x^2+4\geq 0$ and we have that x ≥ 0.

Thus, the domain is 'Set of all real numbers greater than or equal to 0'.

Now, we substitute x= 0 in $c(x)= 6500\sqrt{x^2+4}$ .

i.e. $c(0)= 6500\sqrt{0^2+4}$

i.e. $c(0)= 6500\sqrt{4}$

i.e. $c(0)= 6500\times 2$

i.e. c(0) = 13000.

So, we get that the vertex point of the function is (0,13000).

Thus, the range is 'All real numbers greater than or equal to 13,000'.

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3 years ago

Read 2 more answers

Which product has 4 zeros after the digit 3? 0.03 times 10 with the power of 5. 0.3 times 10 with the power of 4 0.03 times 10 w

sweet [91]

Answer:

$0.3 * 10^5$

Step-by-step explanation:

0.3

^ You need to move the three before the decimal place and leave 4 empty digits (0) between

0.3

3.0

30.0

300.0

3000.0

30000.0

A total of 5 moves.

Each move is equivalent to x, the preceding value, times 10. x * 10

Repeated multiplication times the same factor equates to exponentiation, so for a total of 5 moves, it is notated as $10^5$ , giving you an expression of:

$0.3 * 10^5$

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4 years ago

Jack is 20 miles due north of Edward. Sarah is due east of Edward. The angle between the direction of the shortest distance from

OLEGan [10]

Answer:

The distance between Sarah and Jack is approximately 22 miles

The distance between Sarah and Jack is approximately 9 miles

Step-by-step explanation:

The explanation in the attached file

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3 years ago

A single die is rolled twice find the probability of rolling an even number the first time and a number greater than 5 the secon

Troyanec [42]

The probability of rolling of rolling an even number would be 3/6 because there are three even numbers out of six. If this were rolled twice, it'd be double (it'd become 6/12)
then the probability of rolling a number greater than five on the second turn would be 1/6 because only one number is greater than five on a die, which is six. Again, if it were rolled twice, it'd be double (and become 2/12)

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3 years ago