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3 years ago

If A=B, where on the number line will A appear ?

Mathematics

1 answer:

Lilit [14]3 years ago

8 0

Your answer would be c

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Claire’s bedroom measure’s 16 feet by 18 feet. If the purple carpet that she wants to buy costs $3.59 per square foot, what will

Vlad [161]

Answer:

1033.92

Step-by-step explanation:

I multiplied 16 and 18 to get the area of the room which was 288. Then I multiplied 288 by how much it would cost for one square foot ( 3.59) and got my answer. Sorry if I'm wrong!

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3 years ago

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The price of a phone is decreased by 20% and now is $141.6 Find the original price. = $

Paraphin [41]

the answer of it is $2 the original price

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2 years ago

Please help! I really need this

olga55 [171]

9514 1404 393

Answer:

see below

Step-by-step explanation:

You might do well to refer to the proof referenced here--the previous slide. We assume it more or less matches what we've done in the attachment.

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2 years ago

The isosceles triangle has a base that measures 14 units.

Basile [38]

Answer:

Between 7 and 14

Step-by-step explanation:

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2 years ago

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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:

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