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Sever21 [200]
3 years ago
5

Select all the statements that are true about rectangles.

Mathematics
1 answer:
ivolga24 [154]3 years ago
8 0

Step-by-step explanation:

  1. Diagonals are congruent.
  2. Diagonals bisect angles.
  3. Diagonals are perpendicular.
  4. Diagonals bisect each other.
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What numbers can i add to equal 17
Kay [80]
1+16
15+2
9+8
6+11
5+12
3+14
8 0
3 years ago
How would you go about finding the solution to this system of three equations in three variables? Be specific. For example, you
kupik [55]
I:2x – y + z = 7
II:x + 2y – 5z = -1
III:x – y = 6

you can first use III and substitute x or y to eliminate it in I and II (in this case x):
III: x=6+y
-> substitute x in I and II:
I': 2*(6+y)-y+z=7
12+2y-y+z=7
y+z=-5

II':(6+y)+2y-5z=-1
3y+6-5z=-1
3y-5z=-7

then you can subtract II' from 3*I' to eliminate y:
3*I'=3y+3z=-15

3*I'-II':
3y+3z-(3y-5z)=-15-(-7)
8z=-8
z=-1

insert z in II' to calculate y:
3y-5z=-7
3y+5=-7
3y=-12
y=-4

insert y into III to calculate x:
x-(-4)=6
x+4=6
x=2

so the solution is
x=2
y=-4
z=-1
3 0
3 years ago
Kim drives x miles a week. Terry drives two times more than Kim and Jerry drives three times more than Terry. Which expression r
liberstina [14]
The expression for the amount that Jerry drives is 6x. This can be concluded since 2*3=6. And how to represent it should be described as 6x. 






4 0
3 years ago
Roxanne has 42 hundreds of a dollar in change which shows the amount of change she has left
klasskru [66]
$0.42 that is what your answer would be
7 0
3 years ago
Help
kykrilka [37]

Let n =  the hours elapsed when the two trains are 660 miles apart.


Let the first train travel east and the second train travel west.

The distance traveled by the first train is

x = (50 mi/h)*(n h) = 50n mi


The distance traveled by the second train is

y = (60 mi/h)*(n h) = 60n h


The distance between the two trains after n hours is

x + y = 50 n + 60n = 110n mi


Because this distance is 660 miles, therefore

110n = 660

n = 6 hours


Answer: 6 hours


I hope this helps. Sorry it took so long

3 0
3 years ago
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