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MAVERICK [17]
3 years ago
8

Are these expressions equivalent 20d - 16 and 4(5d - 4)

Mathematics
2 answers:
ELEN [110]3 years ago
4 0

Answer:

Yes

Step-by-step explanation:

If we where to simplfy the 4(5d - 4) it would be 20d - 16 and that is equivalent to 20d - 16.

weqwewe [10]3 years ago
3 0

Answer: Yes they are equivalent

--------------

The reason why is because

4(5d - 4) = 4*(5d) + 4(-4) = 20d - 16

You multiply the outer term 4 by each term inside the parenthesis

4 times 5d = 4*5d = 20d

4 times -4 = 4*(-4) = -16

I'm using the distributive property.

---------------

Alternatively, you can start with 20d - 16 and factor out the GCF 4. Divide each term by 4 to get

20d/4 = 5d

-16/4 = -4

So after dividing each term of 20d-16 by 4, we get 5d-4 and the 4 will be pulled out to say 20d - 16 = 4(5d - 4)

As you can probably see, factoring is just thinking of distributing in reverse. Instead of multiplying each term by the same number, you divide each term by the same number. You can distribute the 4 back in to check your factorization.

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Pani-rosa [81]

perpendicular lines have a slope that is a negative reciprocal


A) 4x-5y=5

subtract 4x

solve for y

-5y = -4x+5

divide by -5

y = 4/5 x+5   slope is 4/5  perpendicular slope is -5/4

y -y1 =m(x-x1)  point slope form of a line

y-3 = -5/4 (x-5)

B)  5x+4y = 37

subtract 5x

4y =-5x +37

divide by 4

y =-5/4 x +37/4  slope is -5/4 perpendicular slope is 4/5

y -y1 =m(x-x1)  point slope form of a line

y-3 = 4/5 (x-5)

C)4x+5y=5

subtract 4x

5y = -4x +5

divide by 5

y = -4/5 x +1

y =-4/5 x +1  slope is -4/5 perpendicular slope is 5/4

y -y1 =m(x-x1)  point slope form of a line

y-3 = 5/4 (x-5)

D)5x-4y=8

subtract 5x

-4y = -5x+8

divide by -4

y = 5/4 x-2

y =5/4 x +-2 slope is 5/4 perpendicular slope is -4/5

y -y1 =m(x-x1)  point slope form of a line

y-3 = -4/5 (x-5)



6 0
3 years ago
Find the perimeter and area
Nitella [24]

Answer:

Step-by-step explanation:  Perimeter is distance around the outside so 8+8+5+5=26 units

Area - I'll get  back with you

5 0
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liraira [26]

Answer:

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To get from 7 to 112, we must multiply by 16. This is the relationship.

So, we must multiply both, the walnut and raisin cookies by 16 also.

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Now that we have all the data, we can make the ratio.

Raisin : Walnut : Pinwheel

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Hope this helps! :)

5 0
3 years ago
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dedylja [7]

Answer: Option D.

Step-by-step explanation:

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let's try our options and see if we can discard other:

B:

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we can discard this option.

C:

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D:

-b/2a = 69.9/2*0.5 = 69.9

This is the only one that fits, so this is the correct option.

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Answer:

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