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3 years ago

Someone please please help

Mathematics

1 answer:

DedPeter [7]3 years ago

6 0

Answer: -80 and -3

Step-by-step explanation: By signed number, do you mean a negative or positive number? If so that means that number one is -80 because she lost 80 dollars which mean that she LOST the money. And the second number is -3 because the number DECREASED

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A researcher recruits a sample of 25 preschool children for a research study by posting an announcement in a local daycare cente

Gelneren [198K]

Answer:

The kind of sampling the researcher is using is Convenience sampling method.

Step-by-step explanation:

Convenience sampling is a kind of non probability sampling. A non probability sampling is a type of sampling where the probability of selecting a sample is not defined.

In case of convenience sampling the researcher targets the population nearest to him/her or the quite accessible population. For example, sampling done at a shopping mall or a college campus.

There are no other conditions applied while conducting a convenience sampling. The only criteria is that the participants are willing to participate. For this too the researcher can offer to pay certain amount to the participants so that they participate in the research.

In the provided problem the researcher samples preschool students at a local daycare center. He also pays $10 for each participation.

This is an example of Convenience sampling method.

4 0

3 years ago

Sales tax is 10.25%. What is the tax on a 300$ bill?

Liula [17]

$30.75
is taxes sale total is 330.75

7 0

3 years ago

I don’t know how to find X

Elza [17]

Go to desmos type the equation and whatever number is on the x line is your answer

4 0

4 years ago

-8/3+5/2 solve this question

levacccp [35]

Answer:

$- \frac{1}{6}$

Step-by-step explanation:

$- \frac{8}{3} + \frac{5}{2} \\ - \frac{8 \times 2}{3 \times 2} + \frac{5 \times 3}{2 \times 3 } \\ - \frac{16}{6} + \frac{15}{6} \\ = - \frac{1}{6}$

8 0

3 years ago

Read 2 more answers

Just need to solve number 8 with quadratic formula

choli [55]

$ax^2+bx+c=0\\\\x_1=\dfrac{-b-\sqrt{b^2-4ac}}{2a}\\\\x_2=\dfrac{-b+\sqrt{b^2-4ac}}{2a}$

$2x^2=8x-7\ \ \ \ |-8x\\\\2x^2-8x=-7\ \ \ |+7\\\\2x^2-8x+7=0\\\\a=2;\ b=-8;\ c=7\\\\b^2-4ac=(-8)^2-4\cdot2\cdot7=64-56=8\\\\\sqrt{b^2-4ac}=\sqrt8=\sqrt{4\cdot2}=2\sqrt2$
$x_1=\dfrac{-(-8)-2\sqrt2}{2\cdot2}=\dfrac{4-\sqrt2}{2}\\\\x_2=\dfrac{-(-8)+2\sqrt2}{2\cdot2}=\dfrac{4+\sqrt2}{2}$

7 0

3 years ago