Answer:
Step-by-step explanation:
Triangles CEF and CAD are similar right triangles (they have the common angle, so by AA postulate they are similar). Similar triangles have proportional corresponding sides, so
Triangles DEF and DBC are similar right triangles (they have the common angle, so by AA postulate they are similar). Similar triangles have proportional corresponding sides, so
Substitute the fraction 
from the first equality into the second equality:
![\dfrac{EF}{30}=1-\dfrac{EF}{40}\ [\text{Muliply by 120}]\\ \\4EF=120-3EF\\ \\4EF+3EF=120\\ \\7EF=120\\ \\EF=\dfrac{120}{7}=17\dfrac{1}{7}\ ft](https://tex.z-dn.net/?f=%5Cdfrac%7BEF%7D%7B30%7D%3D1-%5Cdfrac%7BEF%7D%7B40%7D%5C%20%5B%5Ctext%7BMuliply%20by%20120%7D%5D%5C%5C%20%5C%5C4EF%3D120-3EF%5C%5C%20%5C%5C4EF%2B3EF%3D120%5C%5C%20%5C%5C7EF%3D120%5C%5C%20%5C%5CEF%3D%5Cdfrac%7B120%7D%7B7%7D%3D17%5Cdfrac%7B1%7D%7B7%7D%5C%20ft)
X=2 so the value of x+5 is 7
My dude there is no problem
210 grams into ounces
210 / x = 28.4 / 1
cross multiply
210 = 28.4 x
divide both sides by 28.4
The answer is <span>7.39 ounces
That can be rounded to 7.4 ounces
The package is 210 grams or 7.4 ounces.
Hope this helps :)</span>
-2(1-7n)-5n=34
Multiply the bracket by -2
(-2)(1)=-2
(-2)(-7n)=14n
-2+14n-5n=34
-2+9n=34
Move -2 to the other side. Sign changes from -2 to +2.
-2+2+9n=34+2
9n=34+2
9n=36
Divide by 9 for both sides
9n/9=36/9
n=4
Answer: n=4
