Simplify:
5r3 • 2r5 • 9r2
A.
2700r^10
B.
1440r^30
C.
90r^30
D.
90r^10
The answer is C. 90r^30
To simplify the expression 5r^3 • 2r^5 • 9r^2, you can multiply the numerical coefficients together and combine the variables by adding their exponents.
5 • 2 • 9 = 90
r^3 • r^5 • r^2 = r^(3+5+2) = r^10
Therefore, the simplified expression is: 90r^10.
The correct answer is D. 90r^10.
To simplify the expression 5r^3 • 2r^5 • 9r^2, you need to multiply the coefficients and combine the variables with the same base.
Multiplying the coefficients:
5 • 2 • 9 = 90
Combining the variables with the same base:
r^3 • r^5 • r^2 = r^(3 + 5 + 2) = r^10
Therefore, the simplified expression is 90r^10.
So, the correct answer is option D. 90r^10.