Plz

1. 12a⁹b⁷

2. 6s⁹t⁶

3. y³ + 3y² + 3y +1

Step-by-step explanation:

1. 4a³b² × 3a⁶b⁵

i) multiply the numbers

= (4×3)a³b² × a⁶b⁵

= 12a³b²a⁶b⁵

ii) rearrange the terms

= 12a³a⁶b²b⁵

iii) multiply the terms with the same base by adding their exponents

iv) add the numbers

= 12a⁹b⁷

2. 6s⁵t × s⁴t²

i) rearrange the terms

= 6s⁵s⁴tt²

ii) multiply the terms with the same base by adding their exponents

iii) add the numbers

= 6s⁹t⁶

i) simplify the expression by substracting the exponents

ii) expand the expression using the formula below:

(a+b)³ = a³ + 3a²b + 3ab² + b³