Basic Algebra

What is the algebraic expression for                  "the sum of n and 9"?

• n - 9

• n + 9

• n/9

• 9n

What is an algebraic                     expression for                 "the difference of r and 3"?

• r/3

• r + 3

• r - 3

• 3r

take 10 away from s 

• 10 - s 

• s + 10

• s - 10

• s/10

six times the number of girls
Let g = number of girls

• 6 + g

• 6g

• g - 6

Branch of mathematics that combines symbols according to the rules of arithmetics.

• Algebra

• Arithmetic

• Geometry

• Calculus

7 less than a number d

• 7 - d

• d - 7

18 + f = 30

f = ?

• 12

• 10

• 48

• 22

Solve for x.

• x = 2

• x = 3

• x = 5

• x = 10

Edward's pizza had 23 pepperonis. Then he picked off n pepperonis. Now there are 12 pepperonis left. What algebraic equation shows this situation?

• 12n = 23

• n + 23 = 12

• 23 + 12 = n

• 23 - n = 12

Julius has v gold coins. After some time, he doubled his amount of gold coins. Which algebraic expression shows how many gold coins Julius has?

• 2v

• 2 + v

• 2 - v

• 2 / v