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Marina CMI [18]
1 year ago
14

B

Mathematics
1 answer:
Pavlova-9 [17]1 year ago
3 0

Answer: R_{C, 180^{\circ}} \circ r_{m}

Step-by-step explanation:

The sequence is a reflection over line m followed by a rotation 180 degrees about point C.

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What is the y intrercept and what is the slope of -7y= 7x+21
k0ka [10]

Answer:

The slope is -1 and y-intercept is at y = -3.

Step-by-step explanation:

-7y= 7x+21

Divide through by -7:

y = -x - 3

6 0
3 years ago
Could these side lengths make a right triangle, 12m, 35m and 37m
natta225 [31]

Answer:

Yes

Step-by-step explanation:

Using Pythagorean theorem WHICH ONLY WORKS FOR RIGHT TRIANGLES,

a^2+b^2=c^2 where a and b are the two shortest legs.

12^2+35^2=c^2

144+1225=c^2

c^2=1369

c=\sqrt{1369}

c=37

3 0
3 years ago
Plz help 100 points if you can help me please don't give me the wrong answer
marusya05 [52]

Answer: i believe the answer is d

Step-by-step explanation: sorry if it's wrong but I really think it is d because it says product which is division and d is division please let me know if I was correct or not. thx

3 0
3 years ago
A train travels 110 km in the same time that a plane covers 385 km. If the speed of the plane is 20 km per hr less than 4 times
slamgirl [31]

Answer:

  • train: 40 kph
  • plane: 140 kph

Step-by-step explanation:

Let t represent the speed of the train in km/h. Then 4t-20 is the speed of the plane. Travel times are the same, so we can use the formula ...

  time = distance/speed

and equate the travel times.

  110/t = 385/(4t-20)

Cross multiplying gives ...

  110(4t -20) = 385t

  440t -2200 = 385t . . . . . eliminate parentheses

  55t -2200 = 0 . . . . . . . . . subtract 385t

  t -40 = 0 . . . . . . . . . divide by 55

  t = 40 . . . . . . . . . . . add 40; train's speed is 40 kph

  4t -20 = 140 . . . . . . find plane's speed; 140 kph

The train's speed is 40 km/h; the plane's speed is 140 km/h.

_____

<em>Check</em>

Train's travel time = 110 km/(40 km/h) = 2.75 h.

Plane's travel time = 385 km/(140 km/h) = 2.75 h.

4 0
3 years ago
Read 2 more answers
12, 15. -27. What is the sum of the cards she chose?
diamong [38]

Answer:

Add 12 with 15, we would get 27

If we add 27 with -27, then we would get 0, because if a negative and positive number are the same, then you add them, you will alway's get 0

0 is your answer

4 0
3 years ago
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