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Burka [1]
2 years ago
5

Write the equation of a parabola whose directrix is

Mathematics
1 answer:
suter [353]2 years ago
4 0

Answer:

y=0.5x²-4x-10.

Step-by-step explanation:

1) according to the definition of parabola:

d1=d2, then

2) \ |y+1.5|=\sqrt{(x+4)^2+(y+2.5)^2} ;

3) after evolution:

-(2y+4)=(x+4)²; ⇔

y=-\frac{1}{2}x^2-4x-10.

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Tyrone has 8/9 of a foot of string. He needs to cut pieces of string that are 1/4 of a foot long. How many whole 1/4 foot pieces
Gekata [30.6K]

9514 1404 393

Answer:

  3

Step-by-step explanation:

You can use your number sense to realize that 8/9 is between 3/4 and 1, so Tyrone can only get 3 whole pieces from his string.

__

If you like, you can do the division ...

  (8/9)/(1/4) = (8/9)(4/1) = 32/9 = 3 5/9 . . . . . 3 whole pieces

Or, you can compare decimal values.

  1 piece = 0.25 ft

  2 pieces = 0.50 ft

  3 pieces = 0.75 ft

  4 pieces = 1.00 ft

String length = 0.888.... ft (more than 3; less than 4 pieces)

4 0
3 years ago
Read 2 more answers
I will mark you brainliest!<br><br> find the unit rate to determine the equation of the line
Inessa [10]

Answer:

Unit rate : ( y =2x)

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3 years ago
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The ratio of the length 2.0 meters to the length 1.2 meters is
photoshop1234 [79]

Answer:

The Ration of length 2.0 meters  to the length 1.2 meters = 5 : 3

Step-by-step explanation:

The given two length are 2.0 m  and 1.2 m

Length L1 = 2.0 m     And

Length L2 = 1.2 m

SO, The ratio of L1 : L2 = \frac{2.0}{1.2}

Or, The ratio of L1 : L2 =  \frac{20}{12}

∴    The ratio of L1 : L2 =  \frac{5}{3}

Hence The ratio of L1 : L2 is 5 : 3    Answer

4 0
4 years ago
How to solve −3/4n≤3.
mars1129 [50]

Answer:

n ≥ -4

Step-by-step explanation:

-3/4n ≤ 3

-4/3(-3/4n) ≤ 3(-4/3)

n ≥ -12/3

n ≥ -4

CHECK:

correct

-3/4(-4) ≤ 3

12/4 ≤ 3

3 = 3

correct

-3/4(5) ≤ 3

-15/4 ≤ 3

-3.75 < 3

incorrect

-3/4(1) ≤ 3

-3/4 is not ≤ 3

6 0
3 years ago
All rhombus have all sides that are equal in length but which one are rhombus or not. Need help on this. ​
Artyom0805 [142]

Answer:

I think that the first one is not a rhombus but the last two are.

7 0
3 years ago
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