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2 years ago

Is this relation a function? True or False

Mathematics

1 answer:

VMariaS [17]2 years ago

7 0

Answer: False

Step-by-step explanation:

There is a very easy way to tell whether an ordered pair is a function or not. If many x's have one y, then it is not a function. Since (-1,7) and (-7, 7) both have the same y, it is not a function. Hope this helps!

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If x – 10 is a factor of x2 – 8x – 20, what is the other factor?

Svetach [21]

Answer:

The other factor is $(x+2)$

Step-by-step explanation:

we know that

$(x-a)(x-b)=x^{2}-xb-xa+ab$

$(x-a)(x-b)=x^{2}-(a+b)x+ab$

In this problem we have

$x^{2} -8x-20$

and

$a=10$ -----> because is a factor

substitute and solve for b

$x^{2} -8x-20=x^{2}-(10+b)x+10b$

$8=10+b\\b=-2$

Verify in the second equation

$-20=10b$ -----> $-20=10(-2)$ -----> $-20=-20$ --> is ok

The other factor is $(x+2)$

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2 years ago

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A grocery store sells a bag 7 oranges for $2.66. if alexandra spent $3.42 on oranges how many did she buy

Murljashka [212]

Answer:

9 oranges

Step-by-step explanation:

7 for 2.66 is 38c for 1

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2 years ago

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2.5 (8.6 ÷ 2 – 1.8)

Alina [70]

Answer:

6.25 is the answer

Step-by-step explanation:

work in the () first

2.5(8.6÷2-1.8)

2.5(2.5)

the multiply the two numbers and get 6.25

hope this helps

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2 years ago

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Help me asap!!!! please

Lubov Fominskaja [6]

Answer:

x = 3 should be the answer

Step-by-step explanation:

y is not graphed so y isn't part of the equation while x is so its X = K (K being the number that it goes up on) same thing applies to y if its horizontal then the equation is Y = K)

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dimulka [17.4K]

Answer:

Solution in image belo, make sure to put the lines on the right number's then out the point on (4, -3)

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