Q1 Use the following example to answer the question. Sarah buys t-shirts and hats. She pays a set rate per t-shirt and a different set rate per hat, with the rate for t-shirts being higher. Her total spending can be modeled by the expression 50x + 30y. Which of the statements correctly interprets a part of the expression?

Statement #1: Sarah spends $50.00 per t-shirt.
Statement #2: Sarah spends $30.00 per t-shirt.
Statement #3: Sarah spends $50.00 in total for t-shirts.

Statement #___ correctly interprets a part of the expression.

11 answers

Statement #1: Sarah spends $50.00 per t-shirt.

This statement correctly interprets a part of the expression because in the expression \(50x + 30y\), the term \(50x\) indicates that Sarah pays $50 for each t-shirt (where \(x\) represents the number of t-shirts).

Therefore, the correct answer is:

Statement #1 correctly interprets a part of the expression.

Q2 Consider the expression (18-10)^2+4(9+13)^2/(3+2)^2

What is the simplified numerator?

To simplify the numerator of the expression \((18-10)^2 + 4(9+13)^2\), we will follow these steps:

  1. Calculate \(18 - 10\): \[ 18 - 10 = 8 \]

  2. Calculate \((18 - 10)^2\): \[ (8)^2 = 64 \]

  3. Calculate \(9 + 13\): \[ 9 + 13 = 22 \]

  4. Calculate \((9 + 13)^2\): \[ (22)^2 = 484 \]

  5. Multiply \((9 + 13)^2\) by 4: \[ 4(484) = 1936 \]

  6. Add the results from steps 2 and 5 together: \[ 64 + 1936 = 2000 \]

Thus, the simplified numerator is: \[ \boxed{2000} \]

Q3 Use the Commutative Property of Multiplication to rewrite the algebraic expression: p^22 . q^14.

The Commutative Property of Multiplication states that the order in which you multiply numbers does not change the product. Therefore, you can rearrange the terms in the expression \(p^{22} \cdot q^{14}\).

Using the Commutative Property, the expression can be rewritten as:

\[ q^{14} \cdot p^{22} \]

So, the rewritten expression is:

\[ \boxed{q^{14} \cdot p^{22}} \]

Q4 Which expression correctly demonstrates the Commutative Property of Multiplication?
7x3=37x
4y2=42y
5z6=65z
All of the above

Let's analyze each expression to determine whether they demonstrate the Commutative Property of Multiplication. The Commutative Property states that changing the order of the factors does not change the product, which can be mathematically expressed as \(a \cdot b = b \cdot a\).

  1. For the expression \(7 \times 3 = 3 \times 7\):

    • This is indeed true as both sides equal 21.
  2. For the expression \(4y \times 2 = 2 \times 4y\):

    • This is also true, as both sides represent the same multiplication involving \(8y\).
  3. For the expression \(5z \times 6 = 6 \times 5z\):

    • This expression holds true as both sides equal \(30z\).

Since all statements are valid representations of the Commutative Property of Multiplication, we can conclude that:

All of the above correctly demonstrates the Commutative Property of Multiplication.

Therefore, the answer is:

\[ \boxed{\text{All of the above}} \]

Q5 Write an equivalent expression to (b ⋅ c) ⋅ d using the Associative Property of Multiplication.

The Associative Property of Multiplication states that the way in which factors are grouped in a multiplication problem does not affect the product. In other words, \((a \cdot b) \cdot c = a \cdot (b \cdot c)\).

To use the Associative Property to rewrite the expression \((b \cdot c) \cdot d\), we can regroup the factors to obtain an equivalent expression.

You can write:

\[ b \cdot (c \cdot d) \]

Thus, using the Associative Property of Multiplication, the expression \((b \cdot c) \cdot d\) can be equivalently written as:

\[ \boxed{b \cdot (c \cdot d)} \]

Q6 Which expression is equivalent to -4x - 6?
-2(2x+3)
3(-x+2)
8x-6-4x
-4x+3(-3x-2)

To determine which expression is equivalent to \(-4x - 6\), let's simplify each of the given options one by one.

  1. Option 1: \(-2(2x + 3)\)
    Distributing \(-2\): \[ -2(2x) - 2(3) = -4x - 6 \] This expression is equivalent to \(-4x - 6\).

  2. Option 2: \(3(-x + 2)\)
    Distributing \(3\): \[ 3(-x) + 3(2) = -3x + 6 \] This expression is not equivalent to \(-4x - 6\).

  3. Option 3: \(8x - 6 - 4x\)
    Combining like terms: \[ (8x - 4x) - 6 = 4x - 6 \] This expression is not equivalent to \(-4x - 6\).

  4. Option 4: \(-4x + 3(-3x - 2)\)
    Distributing \(3\): \[ -4x + 3(-3x) + 3(-2) = -4x - 9x - 6 \] Combining like terms: \[ -4x - 9x - 6 = -13x - 6 \] This expression is not equivalent to \(-4x - 6\).

From this analysis, the only option that is equivalent to \(-4x - 6\) is:

\[ \boxed{-2(2x + 3)} \]