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ankoles [38]
3 years ago
9

Simplify 8 + 2(10 – r). 

Mathematics
2 answers:
r-ruslan [8.4K]3 years ago
4 0
8+20-2r which is equal to 28-2r so it is (B)
balu736 [363]3 years ago
3 0

Hi!

8 + 2(10 - r) = 8 + 20 - 2r = 28 - 2r

The correct answer is B. 28 - 2r

Hope this helps!

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Solve each equation for the ind<br>2. 2(x-7)=10​
SVETLANKA909090 [29]

Answer:

x= 12

Step-by-step explanation:

2(x-7) = 10

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3 years ago
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Use the discriminate to determine the number and the nature of the solutions of the giving equation.
PolarNik [594]

Answer:

Since b^2 -4ac = 256 we have 2 real distinct root roots

Step-by-step explanation:

4x^2+12x=7

We need to subtract 7 to get it in the proper form

4x^2+12x-7=7-7

4x^2+12x-7=0

The discriminant is b^2 -4ac

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so a =4   b=12 and c=-7

(12)^2 - 4(4)(-7)

144 +112

256

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If b^2 -4ac = 0 we have one real root

If b^2 -4ac < 0 we have two complex root

Since b^2 -4ac = 256 we have 2 real distinct root roots

7 0
3 years ago
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Answer:

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Step-by-step explanation:

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Tell me if it is wrong.

Thank you.

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