$15 + $32.50 + 8% = $51.30
15 + 32.50 = 47.50
8% × 47.50 = 3.80
47.50 + 3.80 = 51.30
1/10 of 1,700,000 km² is 170,000 km² .
120+34=154
180-154=26
Angle acb=26
Just invert it like:

There you have your common denominator! Don't forget to multiply the numerator as well.
A dot plot would show 7 points for numbers greater than 2.
A histogram would have a maximum of 7 bars.