Plsss help asappp :,)

2. x² + 8y²

3. -6 - 2y³ + 10y²

4. 3a² - 2a

Step-by-step explanation:

2. Two minuses make a plus.

(10x² + 4y²) - (9x² - 4y²) = 10x² + 4y² - 9x² + 4y²

Evaluate like terms.

10x² + 4y² - 9x² + 4y² = x² + 8y²

3. When multiplying terms in a bracket, you must multiply the term outside the bracket to all the terms in the bracket.

-2y²(3y² + y - 5) = (-2y² × 3y²) + (-2y² × y) + (-2y² × -5)

                          = (-6) + (-2y³) + (10y²)

                          = -6 - 2y³ + 10y²

4. When dividing terms in a bracket, you must divide all the terms in the bracket to the term outside the bracket.

(12 - 8a³) ÷ 4a² = (12 ÷ 4a²) + (- 8a³ ÷ 4a²)

                            = (3a²) + (-2a)

                            = 3a² - 2a

for the first question it would be the second answer for the second question it would be the third answer and for the third question it would be the first answer

step-by-step explanation:

answer: the first one

step-by-step explanation: use a calculator and divide the minutes by the dollars.