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Iteru [2.4K]
3 years ago
11

Evaluate b - 2a - c for a = -7, b =3, and c = 7 A. 24 B. -18 C. 3 D. 10

Mathematics
2 answers:
MrRa [10]3 years ago
5 0
The answer is D. 10. I hope I helped!
KatRina [158]3 years ago
3 0
B - 2a - c
= 3 - 2*(-7) - 7
= 3 + 14 -7
= 17 -7
= 10

In short, the answer would be D.10.

Hope this helps !

Photon
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9/20
NISA [10]

For this case we must find the solution of the following quadratic equation:

x ^ 2 + 5x + 7 = 0

Where:

a = 1\\b = 5\\c = 7

Then, the solution is given by:

x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2a}

Substituting the values:

x = \frac {-5 \pm \sqrt {5 ^ 2-4 (1) (7)}} {2 (1)}\\x = \frac {-5 \pm \sqrt {25-28}} {2}\\x = \frac {-5 \pm \sqrt {-3}} {2}

By definition we have:i ^ 2 = -1

x = \frac {-5 \pm \sqrt {3i ^ 2}} {2}\\x = \frac {-5 \pm i \sqrt {3}} {2}

Thus, we have two complex roots.

Answer:

The equation has no real roots.

4 0
4 years ago
Combine like terms to create an equivalent expression. -3.6-1.9t+1.2+5.1t−3.6−1.9t+1.2+5.1t
Andreyy89

Question

Combine like terms to create an equivalent expression.

-3.6-1.9t+1.2+5.1t

Answer:

3.2t - 2.4

Step-by-step explanation:

Given;

-3.6 - 1.9t + 1.2 + 5.1t

Combining like terms means bringing terms that have "t" together and separately, those that don't have "t" together. i.e

=> − 1.9t + 5.1t - 3.6 + 1.2

=> 3.2t - 2.4

Therefore, the equivalent expression is;

3.2t - 2.4

4 0
3 years ago
What is the product of −3/11 and <br> −2/15?
Dafna11 [192]
Multiply -3/11 and -2/15 straight across

-3(-2) = 6
11(15) = 165

6/165 is your product, or 0.036 (rounded)


hope this helps
5 0
4 years ago
Read 2 more answers
Solve this equation 3x + 5 = 7x – 7
Mama L [17]
Add 7 to both sides
3x + 12 = 7x
Subtract 3x
12 = 4x
Divide by 4
x = 3
4 0
3 years ago
Read 2 more answers
Pls help math esperts
MaRussiya [10]

Answer:

Jackson spent $4.25 on his lunch

Step-by-step explanation:

because $6.50- $2.25 is $4.25

6 0
3 years ago
Read 2 more answers
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