Answer:
30
Step-by-step explanation:
So we begin by assigning variables to each side with:
DE = x
EF = y
DF = z
Now we start listing a system of equations from what is given:
x+y+z=81
x=2y
x-4=z
Once we solve that with substitution, we get the result of:
x=34
y=17
z=30.
Since z is the length of DF, the length of DF is 30.
I hope this helped! :D
When 5 is added to 3 more then a certain number, the result is 19
x + 3 + 5 = 19
x + 8 = 19
x = 19 - 8
x = 11 <== ur number
The two friends would both get 2 and 1/2 hope that helps
Answer:
<em>x<20/7</em>
Step-by-step explanation:
The expression is not well written. Fine the correct expression below
Given the expression 7x−9<11
Add 9 to both sides of the expression
7x-9+9<11+9
7x < 20
Divide both sides by 7
7x/7 = 20/7
x < 20/7
<em>Hence the required solution is x<20/7</em>
