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3 years ago

5

Depending on the day of the week, a border guard searches every nth person coming across the border. Each Tuesday every 7th pers

on is checked. What is the name of this method of sampling?
a. Simple Random Sampling
b. Systematic Random Sampling

1 answer:

ELEN [110]3 years ago

3 0

Systematic Random sampling

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The volume code of a cube is given by s to the third power, where s is this side length of the cube. What is the difference of t

yKpoI14uk [10]

Answer:

61 m^3

Step-by-step explanation:

The difference in volume is (5 m)^3 - (4 m)^3, or (125 - 64) m^3, or

61 m^3

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Helppppp on alllll plz

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a. $150

b. 150+20x $\geq$ 630

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3 years ago

What fractions are greater than 11/20<br><br> a- 3/4<br> b - 3/10<br> c - 4/5<br> d - 1/2

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3/4 and 4/5

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What is the sum of 20x^2-10x-30

ivann1987 [24]

Answer:

The sum of the roots is 0.5

Step-by-step explanation:

<u><em>The correct question is</em></u>

What is the sum of the roots of 20x^2-10x-30

we know that

In a quadratic equation of the form

$ax^{2} +bx+c=0$

The sum of the roots is equal to

$-\frac{b} {a}$

in this problem we have

$20x^{2} -10x-30=0$

so

$a=20\\b=-10\\c=-30$

substitute

$-\frac{(-10)} {20}=0.5$

<u><em>Verify</em></u>

Find the roots of the quadratic equation

The formula to solve a quadratic equation is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

$a=20\\b=-10\\c=-30$

substitute

$x=\frac{-(-10)\pm\sqrt{-10^{2}-4(20)(-30)}} {2(20)}$

$x=\frac{10\pm\sqrt{2,500}} {40}$

$x=\frac{10\pm50} {40}$

$x=\frac{10+50} {40}=1.5$

$x=\frac{10-50} {40}=-1$

The roots are x=-1 and x=1.5

The sum of the roots are

$-1+1.5=0.5$ ----> is ok

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3 years ago

The volume of a solid is measured in units cubed. True False

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I think the answer would be true

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