What is 2 5/8 as an impropper fraction

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Question 4 of 10 2 points what is the second part of the process of investigating a question using data? a. rephrasing the question o b. describing the data c. collecting the data o d. making an inference submit