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Stolb23 [73]
3 years ago
12

I need help with a,b,c, and d

Mathematics
2 answers:
telo118 [61]3 years ago
7 0
A. -4
b. -6
c. 0 if the expression is 6 - 8 + 2  but if it is 6 - 8 ÷ 2 = 2
d. -2.1
OLga [1]3 years ago
6 0
A) -5 +1 =-4
B) 3(5-7)
=3(-2)=-6
C) can’t really see if is plus 2 or divided by 2
So 6-8/2 =-2/2=-1
And if 6-8+2= -2+2=0
D) 6.5+4.3(-2)
=6.5-8.6
=-2.1
Hope this helps!
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shusha [124]

Answer:

C

Step-by-step explanation:

you need to find how many cups of water were used in the game:

512-384=128

and then you can begin to calculate the number after that:

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hope it'll help! have a good day!

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3 years ago
What are the real zeroes of x3 + 6 x2 – 9x - 54?
o-na [289]

Answer:

Option B 3,-3,-6 is correct.

Step-by-step explanation:

We need to find real zeroes of x^3+6x^2-9x-54

Solving

x^3+6x^2-9x-54\\=(x^3+6x^2)+(-9x-54)

Taking x^2 common from first 2 terms and -9 from last two terms we get

=(x^3+6x^2)+(-9x-54)\\=x^2(x+6)-9(x+6)\\

Taking (x+6) common

(x+6)(x^2-9)\\

x^2-9 can be solved using formula a^2-b^2 = (a+b)(a-b)

=(x+6)((x)^2-(3)^2)\\=(x+6)(x+3)(x-3)

Putting it equal to zero,

(x+6)(x+3)(x-3) =0\\x+6 =0, x+3=0\,\, and\,\, x-3=0\\x=-6, x=-3\,\, and\,\,  x=3

So, Option B 3,-3,-6 is correct.

7 0
3 years ago
Write 6,321.75 rounded to the nearest tenth.
Nutka1998 [239]
Well, the rule of rounding is: if the number is higher than 5, or 5, you round up, and if it is lower than 5, you round down. 5 gets rounded up, so that makes 7 and eight, and eight is higher than 5 so it also gets rounded up, so that would be 6,322. If the decimals were lower, than you would have gotten 6,320, but we rounded up, so 6,322 is the correct answer. Did this help?

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3 years ago
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Line PQ passes through the points P(-5,-13) and Q(5,17) what is the equation of line PQ in standard form
PSYCHO15rus [73]

Answer:

3x - y =  - 2

Step-by-step explanation:

The given line PQ passes through the points P(-5,-13) and Q(5,17) .

Find the slope using the formula:

m =  \frac{y_2-y_1}{x_2-x_1}

Plug in the points to get:

m =  \frac{17 -  - 13}{5 -  - 5}

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Use the point-slope formula :

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Substitute the point (5,17)

y - 17 = 3(x - 5)

Expand:

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The standard form is when the equation is put in the form

ax + by = c

Regroup the terms to get:

3x - y =  - 17 + 15

The standard form is

3x - y =  - 2

8 0
3 years ago
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