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lina2011 [118]
3 years ago
11

What’s the equation for four times the difference of a number and 7 is 12

Mathematics
1 answer:
leva [86]3 years ago
3 0
4(x-7)=12 is the answer
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The focus of a parabola is (0, -3) and the directrix is y = 3. What is the equation of the parabola?
mart [117]
Focus has coordinates (0, a)
a = -3
Thus, 4a = 4(-3) = -12

Because a is negative, we know it will be a concave down or concave left parabola. Hence, A and D can be eliminated. And we know it has to be B because the directrix is the horizontal line y = 3. Hence, the equation of the parabola becomes:

x^{2} = -12y or y = -\frac{1}{12}x^{2}
5 0
3 years ago
Helppppppppppppppppppppp
serg [7]
The first thing you should do in this case is to compose both functions:
 f (x) = x + 7
 g (x) = 1 / (x-13)
 Making the composition
 f (g (x)) = (1 / (x-13)) + 7
 f (g (x)) = (7 (x-13) +1) / (x-13)
 Answer:
 The domain of the function is:
 x other than 13
 (option 4)
4 0
3 years ago
Read 2 more answers
6b x 3 =<br><br> PLEAS HELP ME
MArishka [77]
18 bytes looked it up online lol
4 0
2 years ago
I really need help with this equation as soon as possible :D
viktelen [127]
The subtraction sign in front of the second set of parenthesis changes the signs on the terms inside those parenthesis.  So this could be rewritten as  x-3x^4+2x^2+x^3-4x^6.  None of the exponents on the x are the same, so we will just express it in terms of descending powers of x.   -4x^6-3x^4+x^3+2x^2+x.   This is also the same as  4x^6+3x^4-x^3-2x^2-x  if you don't like to start with a negative.  Either one is correct.
7 0
3 years ago
Help please I need the answers
Cerrena [4.2K]

Answer:

.8

Step-by-step explanation:

6 0
3 years ago
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