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vodka [1.7K]
3 years ago
13

Kari is adding a ribbon border to the edge of her kite. Two sides of the kite measure 9.5 inches each, and the other two sides m

easure 17.8 inches each. How much ribbon does Kari need?
A )45.1 inches
B ) 27.3 inches
C ) 36.8 inches
D ) 54.6 inches
Mathematics
2 answers:
Mariana [72]3 years ago
7 0
The answer is D) 54.6 inches

9.5 × 2 =19
17.8 × 2 = 35.6
19 + 35.6 =  54.6
mamaluj [8]3 years ago
5 0

Answer:

D.) 54.6 inches

Step-by-step explanation:

Multiply 9.5 times 2

9.5*2=19

Multiply 17.8 times 2

17.8*2=35.6

Add 19 to 35.6

19+35.6=54.6

The answer is D.) 54.6 inches

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Choose a point with a negative x coordinate and a positive y coordinate.

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According to the two-way table, how many people chose Decision Y?
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Which is greater 2/3 or 3/5
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Read 2 more answers
Select the correct answer from each drop-down menu. A parabola is given by the equation y = x2 − 2x − 3. The directrix of the pa
choli [55]

Answer:

Part 1) The directrix of the parabola is y=-4.25

Part 2) The focus of the parabola is F(1,-3.75)

Step-by-step explanation:

we have

y=x^{2}-2x-3

This is a vertical parabola open upward

we know that

If a parabola has a vertical axis, the standard form of the equation of the parabola is

(x - h)^{2}=4p(y - k)

where

p≠ 0

The vertex of this parabola is at (h, k).

The focus is at (h, k + p).

The directrix is the line y = k - p.

The axis is the line x = h.

step 1

Convert the equation of the parabola in standard form

y=x^{2}-2x-3

y+3=x^{2}-2x

y+3+1=x^{2}-2x+1

y+4=x^{2}-2x+1

y+4=(x-1)^{2}

so

(x-1)^{2}=(y+4) ----> equation in standard form

The vertex is the point (1,-4)

4p=1 ------> p=1/4

step 2

Find the directrix of the parabola

The directrix is the line y = k - p

we have

k=-4

p=1/4

substitute the values

y = k - p

y=-4-(1/4)=-17/4

y=-4.25

step 3

Find the focus of the parabola

we know that

The focus is at (h, k + p).

we have

h=1

k=-4

p=1/4

substitute

F(1,-4+1/4)

F(1,-3.75)

4 0
3 years ago
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