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tankabanditka [31]
3 years ago
10

Please answer this and thank you If DF=78, DE=5x-9, and EF=2x+10, find EF.

Mathematics
2 answers:
gregori [183]3 years ago
6 0
DE + EF = DF
5x - 9 + 2x + 10 = 78
7x+ 1 = 78
7x = 77
x = 77/7 = 11

EF = 2x + 10
EF = 2*11 + 10
EF = 22 + 10
EF = 32
AleksAgata [21]3 years ago
6 0

Question

If DF = 78, DE = 5x-9, and EF = 2x+10, find EF.

Answer

EF = 32

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mamaluj [8]

Answer( 9 trips )

Step-by-step explanation:

44-17=27

27/3=9

basically you take away 17 kilometers she has already cycled from 44 then divide by 3 because each trip is 3 kilometers which equals 9 trips left.

hope this helped :)

4 0
3 years ago
Read 2 more answers
How to do y=5x+2 and 3x=-y+ 10
Sunny_sXe [5.5K]
Answer:
y = 5x + 2
5 is the slope 2 is the y-intercept
3x = -y + 10 turns into y = -3x + 10
-3 is the slope 10 is the y-intercept
they intersect at (1, 7)

step-by-step explanation:
I’m not sure what you are wanting me to do with these but i will give you all the information about them
y = 5x + 2 is already in slope-intercept form
5 being the slope and 2 being the y-intercept
to solve for 3x = -y + 10
-3x+y +y-3x
y = -3x + 10
the slope is -3
the y-intercept is 10
they intersect at (1, 7)
5 0
3 years ago
A rectangle's length is twice its width. if the perimeter is 120 cm, find the width of the rectangle.
dangina [55]
Let's use the formula to find the perimeter of a rectangle.
2l+2w=120
We know that the length is twice its width; the equation would be:L=2w
We can plug that in to the formula.
2(2w)+2w=120
4w+2w=120
6w=120
120÷6=20=w
Since the length is twice its width, 20×2=40. The length is 40 cm.
The width is 20 cm.
Tell me if this helps!!
4 0
3 years ago
Change to standard form. Can someone help with these 3 please, ty!
grigory [225]

Answer:x + 12y = 4

9x + y = 10

-9x + y = -7

Step-by-step explanation:idk for sure tho man

3 0
4 years ago
Which one is the answer need help​
fgiga [73]

Answer:

None of the above.

The answer is 8.4 which is <u>greater than 8 and less than 9</u>. But that option isn't there. Therefore, the answer is none of the above.

3 0
4 years ago
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