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mel-nik [20]
3 years ago
10

F(x) = -x^2+3 find f(-2)

Mathematics
1 answer:
Fiesta28 [93]3 years ago
7 0

f(x) = -x² + 3

f(-2) = -(-2)² + 3 = -4 + 3 = -1

Answer → f(-2) = -1

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A science test has 20 questions. A student answers 80% of the questions correctly.
natita [175]

Answer:

16 questions answered correctly

Step-by-step explanation:

Since the student answered 80% of the questions correctly, we can find 80% of 20 to answer this question.

[] First we will convert the percent into a decimal format;

80% / 100 = 0.8

[] Then we will multiply this by 20 to find our answer;

20 * 0.8 = 16 questions answered correctly

8 0
2 years ago
Erin earned $25 last week for 5 hours of baby-sitting. This week she earned $40 for 8 hours of baby-sitting. What was her hourly
Elena-2011 [213]

Answer:

5 dollars

Step-by-step explanation:

  1. 25/5 = 5 (25 dollars for 5 hours. Divide 25 and 5 to get how many dollars she earned for one hour)
  2. 40/8 = 5 (Each hour she earned $5 since 40/8=5 and 25/5=5

~Jax

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3 years ago
Which part of this graph shows a nonlinear relationship?
Sunny_sXe [5.5K]

Answer:

2

Step-by-step explanation:

6 0
2 years ago
4p? + 4p - 8<br> what is this polynomials degree and number of terms
Fittoniya [83]

UHMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

7 0
3 years ago
The standard form of the equation of a parabola is x = y2 + 10y + 22. What is the vertex form of the equation?
iVinArrow [24]

From the conics form of the equation, shown above, I look at what's multiplied on the unsquaredpart and see that 4p = 4, so p = 1. Then the focus is one unit above the vertex, at (0, 1), and the directrix is the horizontal line y = –1, one unit below the vertex.

vertex: (0, 0); focus: (0, 1); axis of symmetry: x = 0; directrix: y = –1

Graph y2 + 10y + x + 25 = 0, and state the vertex, focus, axis of symmetry, and directrix.

Since the y is squared in this equation, rather than the x, then this is a "sideways" parabola. To graph, I'll do my T-chart backwards, picking y-values first and then finding the corresponding x-values for x = –y2 – 10y – 25:

To convert the equation into conics form and find the exact vertex, etc, I'll need to convert the equation to perfect-square form. In this case, the squared side is already a perfect square, so:

y2 + 10y + 25 = –x 
(y + 5)2 = –1(x – 0)

This tells me that 4p = –1, so p = –1/4. Since the parabola opens to the left, then the focus is 1/4 units to the left of the vertex. I can see from the equation above that the vertex is at (h, k) = (0, –5), so then the focus must be at (–1/4, –5). The parabola is sideways, so the axis of symmetry is, too. The directrix, being perpendicular to the axis of symmetry, is then vertical, and is 1/4 units to the right of the vertex. Putting this all together, I get:

vertex: (0, –5); focus: (–1/4, –5); axis of symmetry: y = –5; directrix: x = 1/4

Find the vertex and focus of y2 + 6y + 12x – 15 = 0

The y part is squared, so this is a sideways parabola. I'll get the y stuff by itself on one side of the equation, and then complete the square to convert this to conics form.

y2 + 6y – 15 = –12x 
y2 + 6y + 9 – 15 = –12x + 9 
(y + 3)2 – 15 = –12x + 9 
(y + 3)2 = –12x + 9 + 15 = –12x + 24 
(y + 3)2 = –12(x – 2) 
(y – (–3))2 = 4(–3)(x – 2)

Then the vertex is at (h, k) = (2, –3) and the value of p is –3. Since y is squared and p is negative, then this is a sideways parabola that opens to the left. This puts the focus 3 units to the left of the vertex.

vertex: (2, –3); focus: (–1, –3)

6 0
3 years ago
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