21) 3(2j-k)=108 It is asking you to set the equation equal to j
distribute the 3
6j-3k=108
move k to the other side by adding on both sides
6j=108+3k
divide everything by 6
j=18+0.5k
Answer: 70
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Answer:

Step-by-step explanation:
see the attached figure to better understand the problem
step 1
In the right triangle ADE
Find the value of h1
See the attached figure
h1=AD

Solve for h1

step 2
In the right triangle ABC
Find the value of h2
See the attached figure
h2=BC

Solve for h2

step 3
Find the height of the neighboring building
we know that
The height of the neighboring building is equal to

substitute the values

Round to the nearest tenth of a foot

Answer:
Your answer is $41.60
Due to the fact that u just need to add 4% to 40
(☞゚ヮ゚)☞ $41.60 ☜(゚ヮ゚☜)