Question

the movement of the progress bar may be uneven because questions can be worth more or less (including simplify: $-14cd - 2c^{2}d^{2}+15cd + 9c^{2}d^{2}-15cd$ $7c^{2}d^{2}-14cd$ $-7c^{7}d^{7}$ $7c^{4}d^{4}-14c^{3}d^{3}$ $11c^{2}d^{2}+44cd$)

Explanation:

Step1: Combine like terms for \( cd \) terms

We have the \( cd \) terms: \(-14cd + 15cd - 15cd\).
First, calculate \(-14cd+15cd = cd\), then \(cd - 15cd=-14cd\).

Step2: Combine like terms for \( c^{2}d^{2} \) terms

We have the \( c^{2}d^{2} \) terms: \(-2c^{2}d^{2}+9c^{2}d^{2}\).
Calculating \(-2c^{2}d^{2} + 9c^{2}d^{2}=7c^{2}d^{2}\).

Step3: Combine the results

Combining the results from Step 1 and Step 2, we get \(7c^{2}d^{2}-14cd\).

Answer:

\(7c^{2}d^{2}-14cd\) (corresponding to the first option: \(7c^{2}d^{2}-14cd\))