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daser333 [38]
3 years ago
9

A transformation maps a onto b and c onto d name the image of a name the preimage of b name the image of c name the preimage of

d
Mathematics
1 answer:
Doss [256]3 years ago
7 0

If a transformation maps a \mapsto b, then b is the image of a, and a is the preimage of b. So,

  • the image of a is b
  • the preimage of b is a
  • the image of c is d
  • the preimage of d is c
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there are 75 students in a speech contest. Yesterday, 1/3 of them gave their speeches. Today, 2/5 of the remaining students gave
Aloiza [94]

Answer:

30 students

Step-by-step explanation:

Yesterday: 1/3 of the 75 students (75 / 3) = 25 students

There are now 50 students remaining to give their speeches.

Today: 2/5 of the 50 students (50 / 5 = 10 x 2 ) = 20 students

50 - 20 = 30 students remaining to give their speeches.

7 0
3 years ago
In the year 2000, a person bought a new car for $16500. For each consecutive year after that, the value of the car depreciated b
hodyreva [135]

Answer: 13100

Step-by-step explanation:

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3 years ago
The radius of is circle is 3 kilometers. what is the length of a 180 arc?
NeX [460]

Answer:

9.43km

Step-by-step explanation:

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8 0
3 years ago
Akshat lost 14 baseball cards from his card collection. He realized that he has lost 28 % of his cards. How many cards were in h
rodikova [14]

Answer:

50 cards

Step-by-step explanation:

We can start by saying that his total card collection has x cards in it, meaning that 28% or 28/100 of his total cards, x, is equal to 14. Next, we can divide by 28/100 on both sides, and dividing is the same as multiplying by the reciprocal. The reciprocal of 28/100 is 100/28, so 14 * 100/28 is equal to 100/2, which is 50. We can say that 50 cards were in his card collection initially.

4 0
3 years ago
What is an equation of a parabola with the given vertex and focus vertex (0 0) focus (2.5, 0)?
ivolga24 [154]
We most often deal with vertical parabolas (open up or down) and horizontal parabolas (open right or left). For this type of parabolas vertex and focus lie on same vertical or horizontal line. Parabola opens up to the side that contains focus. If focus is left of vertex parabola opens to left.

If we have horizontal parabola formula is:
(y-k)^{2} =4a(x-h)
If we have vertical parabola formula is:
(x-h)^{2} =4a(y-k)

In this problem we have:
vertex (0,0)
focus (2.5,0)

We can see that focus is right of vertex so parabola opens to right. It is horizontal parabola. We will use formula:
(y-k)^{2} =4a(x-h)
Where:
vertex(h,k) = (0,0)
a = distance between vertex and focus:
a= \sqrt{ ( x_{2}- x_{1} )^{2}+( y_{2}- y_{1} )^{2}  } = \sqrt{( 0- 2.5 )^{2}+( 0-0)^{2}} =2.5

Now we can insert these numbers:
(y-0)^{2} =4*2.5(x-0)
y^{2} =10x
6 0
3 years ago
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