C. 30 = 2n - 4
D. 30 = 2 - 4n
a number y minus nine 15
Translate the following word sentences to algebraic equation
7. Thirty is equal to twice a number n decreased by four
A. 30 - 2n = 4
B. 30 – 2n = 4
8. Eight times a numberſ increased by six is forty-eight
A. 8f – 6=48
B. Sfx6 = 46
9. What is the variable in the algebraic expression 4z + 18?
A. 4
C. 18
D. a
10. It is any letter or symbol that represents a number.
A. variable
B. constant
C. expression
C. 88+ 6 = 48
D. 8f + 6 = 48
B. Z
D. equation​