Which property could be used to find the missing number?

(–8 + 3.1) • (4.2 + 7) = (4.2 + 7) • (–8 + )

a.
associative property

b.
commutative property

c.
distributive property

What are the soultion(s) to the quadratic equation 40- x^2=0

What is the expression in factored form? 3x^2 + 18x + 24 a. 3(x+2)(x+4) b. 3(x-2)(x+4) c. 3(x-2)(x-4) d. 3(x+2)(x-4)

What is the least common multiple for 6 and 8? what is the least common multiple for 4 and 12 ? what is the least common multiple for 11 and 12? what is the least common multiple for 3 and 6?