Basic Algebra Pretest

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

• n - 9

• n + 9

• n/9

• 9n

take 10 away from s 

• 10 - s 

• s + 10

• s - 10

• s/10

If you multiply a number by 6 and then add 4, the result is 40. What is the number?

• 4

• 5

• 6

• 7

Answer explanation

To find the number, subtract 4 from 40 to get 36. Then divide 36 by 6 to get the number, which is 6. Therefore, the correct number is 6.

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

• Algebra

• Arithmetic

• Geometry

• Calculus

If the sum of two numbers is 20 and their difference is 4, what are the numbers?

• 8 and 12

• 10 and 10

• 11 and 9

• 12 and 8

Answer explanation

The correct numbers are 8 and 12 because when you add them, you get 20 (8 + 12 = 20) and when you subtract them, you get 4 (12 - 8 = 4).

• 7

• 5

• 11

• 3

Answer explanation

To solve the equation, add 5 to both sides to isolate x. This gives 3x = 21. Then divide by 3 to find x = 7. Therefore, the correct answer is 7.

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

• 6 + g

• 6g

• g - 6

7 less than a number d

• 7 - d

• d - 7

How many blocks will the next term have?

• The next term will have 16 blocks

• The next term will have 15 blocks.

• The next term will have 14 blocks.

• This is the end of the pattern.

7g + 5 + 6g  - 3

• 13g - 3

• 12g + 5

• 13g + 2

• 13g - 2