Write (3x^4)(-6x) in *simplest* form. PLEASE HELP AND SHOW WORK THANKS! :)

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Sweet t saved 20 percent of the total cost of the green-eyed fleas new album let there be fleas on earth. if the regular price is $30 how much did sweet save

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove