What is the simplified form of the following expression?

Question

7m^2 + 6.5n - 4n + 2.5m^2 - n

a. 9.5m^2 + 1.5n (?)
b. 4.5m^2 + 1.5n
c. 1.5m^2 - 4.2n
d. 9.5m^2 - 1.5n

Simplify the following expression.

1/3(21m + 27)

a. 7m + 27
b. 7m + 9 (?)
c. 63m + 9
d. 7m + 81

What is the sum?

7/4 + (-1/5)

a. 31/20 (?)
b. 39/20
c. 6/9
d. -7/20

Answer 1

Yup, they are all correct. :)