1. 6.73 x 10^6
2. 1.33 x 10^4
3.9.77 x 10^22
4. 3.84 x 10^5
The rest i didn’t understand what where you trying to say
120+x+16+x=180
2x+ 136=180
2x=44
X= 22
<B= 22
The answer is 
Let's build the expression piece by piece, translating sentences into formulas:
"3/5 times..." 
"5 less than a number..." 
So, the first block becomes
"3/5 times 5 less than a number..." 
"...is no more than 27" 
So, putting the pieces together, you have the answer
Since 18 is one twentieth of the angle of a full circle, 360, the circumference is 20 times the arc distance of 15, or 300