20) Answer is: x=76
21) Answer is x=15
Step-by-step explanation:
Using log properties


Then

Plug in the knowns


Answer:
x=4
Step-by-step explanation:
Since both triangles are similar, you can make an equation 12/5x-2 = 16/6x. When you cross multiply you get 72x=80x-32. Then you transfer the 80x and you get -8x = -32. Then you divide by -8 and you get x=4.