KAP Grade 6 Expressions and Equations. Practice it free.

The terms $4x$ and $x$ are like terms: $4x + x = 5x$. The constant $9$ stays the same, so the expression is equivalent to $5x + 9\textsf{.}$

Combine: $2x + -4x = -2x$, $-7 + 3 = -4$. Result: $-2x - 4$.

$2^{4} = 2 \cdot 2 \cdot 2 \cdot 2 = 16\textsf{.}$

The base $4$ appears $3$ times as a factor, so $4 \times 4 \times 4 = 4^{3}$.

Multiply first: $4 \cdot 5 = 20$. Then $6 + 20 - 5 = 21$.

$\,2^2 = 2 \cdot 2 = 4$.

The constants $10$ and $-4$ are like terms: $10 - 4 = 6$. The term $t^{2}$ stays the same, so the expression is equivalent to $t^{2} + 6\textsf{.}$

Distribute 4: $4 \cdot 7x + 4 \cdot 2 = 28x + 8$.