A. What volume in milliliters of 9.950×10−2 M sodium hydroxide solution is required to reach the equivalence point in the complete titration of a 17.0 mL sample of 0.134 M phosphoric acid? Express your answer using three significant figures.

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

i just learnt this recently but i need to look through my notes again

i think it's c. i'm not sure but i think so.

the answer is 75.0%.