2YA Ch.1 Test Review

Eight increased by three times a number

• 3x+8

• 8-3x

• 3+8

• 8x+3

17 less than 5 times a number

• 17-5n

• 5n-17

• 5-17n

• 17n-5

Answer explanation

The question '

17 less than 5 times a number

' translates to a mathematical expression where we subtract 17 from the product of 5 and a number. This is represented as '5n - 17', hence making '

5n-17

' the correct answer.

• 1

• 32

• 12

• 24

Answer explanation

The question asks us to simplify the given mathematical expression using PEMDAS. PEMDAS stands for Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction. Following PEMDAS, the expression simplifies to 24, which corresponds with the correct choice.

• 23

• 47

• 9.3

• 42

Answer explanation

The question asks to simplify an expression using PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction) rule. First, we perform multiplication inside parentheses, 6*6=36. Then, we perform division, 66/6=11. Lastly, we do addition, which gives us 36+11=47. So, the correct answer is 47.

• 10

• 45

• 39

• 4

Answer explanation

The question asks to evaluate the expression '7x-3' given 'x=6'. We just need to substitute 'x' with '6' in the expression. So, it becomes '7*6 - 3' which is '42 - 3'. Therefore, the correct answer is '39'.

Use the Distributive Property to simplify:

3(2y-7)

• 5y-21

• 6y+21

• 6y-21

• 5y+21

Answer explanation

The Distributive Property states that a(b+c) = ab+ac. Applying this to the question, we multiply 3 with each term inside the parentheses. So, 3*2y gives 6y and 3*-7 gives -21. Therefore, the simplified form of the expression is 6y-21.

Simplify by Combining Like Terms:

7p-2r+3p+5r

• 10p+3r

• 4p+7r

• 4p-3r

• 10p+8r

Answer explanation

To solve this question, we need to combine like terms. In the given expression, '7p' and '3p' are like terms and '2r' and '5r' are also like terms. Add the coefficients of 'p' (7+3) and 'r' (-2+5) separately, the simplified expression becomes '10p + 3r', which is the correct answer.

Is the following a function?

• Yes

• No

What Number Property is represented below:

9+0=9

• Multiplicative Property of Zero

• Multiplicative Identity

• Additive Identity

• Additive Inverse

Answer explanation

The question is asking for the mathematical property that makes the equation 9+0=9 true. The correct answer is Additive Identity, which states that any number plus zero will result in the original number. Thus, the statement holds true for any number, not just 9.

Given the following set of ordered pairs in this relation:  {(2,1), (1,3), (3,5), (4,0)}

Does this represent a function?

• Yes

• No

Answer explanation

The given ordered pairs represent a function. In a function, every input (X-value) is related to exactly one output (Y-value). Here, none of the X-values in the pairs (2,1), (1,3), (3,5), and (4,0) are repeated, hence the answer is Yes.