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3 years ago

Classifying and ordering real numbers

Mathematics

1 answer:

Nata [24]3 years ago

3 0

What's the question?

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Dwayne hikes 60 miles in 3 days. At that rate, how many days does it take him to hike a total of 240 miles

NNADVOKAT [17]

12 days. 60 is a quarter of 240. So, multiply 60 by 4 to get 240.

7 0

2 years ago

Read 2 more answers

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

ivann1987 [24]

Answer:

The sum of the roots is 0.5

Step-by-step explanation:

The correct question is

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

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

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

substitute

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

Verify

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

5 0

3 years ago

What is the area in square feet of the part of the floor that is not covered by the rug

ohaa [14]

Can you please add a picture of the problem or type all the measurements and information?

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3 years ago

The probability that an event will occur is 2/3 what is the best answer of this event likely occurring

Oduvanchick [21]

It's likely that the event will occur.

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2 years ago

The population of a city is expected to decrease by 6% next year. If x represents the current population, write an expression th

Kaylis [27]

Given:

Current population = x

The population of a city is expected to decrease by 6% next year.

To find:

The expression that represents the expected population next year.

Solution:

We have,

Current population = x

Decrease rate = 6%.

Expected population next year = Current population - 6% of Current population

= $x-\dfrac{6}{100}x$

= $x-0.06x$

= $0.94x$

Therefore, the expression for the expected population next year is 0.94x.

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2 years ago