The velocity of the particle is given by
Since 
and 
, we get
Similarly, the position function is obtained via
We know 
and we're told that 
, so
making the answer A.
This is kinda hard to explain but I'll try my best. Here's a tip, the fractions that are on the ruler really mean 10,20,30,40,50,60,70,80,90, and 100. So, when you look at the decimals on number 7, you have to try to turn them into fractions in your head. For example, 0.9 is actually 9/10 or 90.
t h e r e c i p r i c l e o f - 2 i s 2
<span><span>(<span><span>9a</span>+2</span>)</span><span>(<span><span>9a</span>+2</span>) or, </span></span><span><span>(<span><span>9a</span>+2</span>)</span><span>^2</span></span>
1/10 the value of 237 means we must multiply 1/10 by 237
1/10 * 237 = 23.7
Hope this helps!
