How could you apply the Associative Property of Multiplication to the expression (-5)(-5)(2)(6) to make it easier to simplify? PLEASE HELP I DONT UNDERSTAND!

Atrucker had a load of grain containing 2 tons. she unloaded 1 ton and 1,200 pounds at the warehouse. how much grain does she still have left on the truck?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?