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Paha777 [63]
3 years ago
13

Please hurry please

Mathematics
1 answer:
Elza [17]3 years ago
3 0

Answer:

C is greater than or equal to 20, so the answer is C=20

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Factor the quadratic equation below to reveal the solutions. X^2+4x-21=-9
a_sh-v [17]

Answer:

x = 3 and x = -7

Step-by-step explanation:

The given quadratic equation is x^2+4x-21=0. We need to find the solution of this equation.

If the equation is in the form of ax^2+bx+c=0, then its solutions are given by :

x=\dfrac{-b\pm \sqrt{b^2-4ac} }{2a}

Here, a = 1, b = 4 and c = -21

Plugging all the values in the value of x, such that :

x=\dfrac{-b+ \sqrt{b^2-4ac} }{2a},\dfrac{-b- \sqrt{b^2-4ac} }{2a}\\\\x=\dfrac{-4+ \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)},\dfrac{-4- \sqrt{(4)^2-4\times 1\times (-21)} }{2(1)}\\\\x=3, -7

So, the solutions of the quadratic equation are 3 and -7.      

6 0
3 years ago
I need help please ..
koban [17]

A is 18

B is 162

C is 18

D is 162

4 0
3 years ago
Pre algebra help ( will give brainliest ) sorry if it's hard to see
valentinak56 [21]
It would have changed by 1/3 is ur answer
4 0
3 years ago
Read 2 more answers
Covert 110% to a decimal
omeli [17]
That would be 1.1 in decimals.
5 0
3 years ago
Please help meeeeee ASAP
Fiesta28 [93]

Answer:

36 degrees

Step-by-step explanation:

180 - 58 = 122 degrees

122 - 90 = 32 degrees

32 + 4 = 36 degrees

8 0
3 years ago
Read 2 more answers
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