Raul is playing a trivia game. At the end of the first round, he has 7 points. During the second round, he loses 15 points. Which expressions represent the total amount of points Raul has at the end of the second round? A. 7 - (- 15)
B. 7 + 15
C. 7 + (- 15)
D. - 7+ ( - 15)
E. - 7 - 15
F. 7 - 15

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

The equatorial radius of earth is approximately 6 × 10^3 km, while the equatorial radius of saturn is approximately 6 × 10^4 km. which of the following is true? a. the equatorial radius of saturn is approximately one hundred times that of earth. b. the equatorial radius of saturn is approximately ten times that of earth. c. the equatorial radius of earth is approximately one hundred times that of saturn. d. the equatorial radius of earth is approximately ten times that of saturn.

This question is hard for me to answer can you me. the question is find the value of x.